Addenda to American National Standard Z21.67-1978, Z21.67a-1981 for mechanically actuated automatic vent damper devices for use with gas-fired appliances



Addenda to American national standard Z21.10.1-1975, Z21.10.1a-1978 for gas water heaters

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000558546 / 1980-10-01
Date of Publication:
March 14, 1980
Date of Creation:
1979
Date in Notice:
notice: 1979
Title:
Addenda to American national standard Z21.10.1-1975, Z21.10.1a-1978 for gas water heaters : v. I, automatic storage water heaters with inputs of 75,000 B T U per hour or less : A N S I Z21.10.1b-1979 / secretariat, American Gas Association.
Basis of Claim:
New Matter: "revisions throughout this text."
Previous Registration:
Prev. reg. 1979, TX 381-178.
Imprint:
Cleveland : The Association, c1979.
Description:
35 p.
Other Title:
Gas water heaters
American national standard Z21.10.1-1975, Z21.10.1a-1978 for gas water heaters
Copyright Claimant:
American Gas Association
Authorship on Application:
revisions and additional text: American Gas Association, employer for hire.
Names:
American Gas Association (268 documents)
example document: American national standard for earthquake actuated automatic gas shutoff systems

Copyrights records by American Gas Association

Addenda to American national standard Z21.64-1978 for direct vent central furnaces

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000664048 / 1981-02-18
Date of Publication:
December 3, 1980
Date of Creation:
1980
Title:
Addenda to American national standard Z21.64-1978 for direct vent central furnaces : A N S I Z21.64a-1980 / secretariat, American Gas Association.
Basis of Claim:
New Matter: revisions.
Previous Registration:
Prev. reg. 1979, TX 222-250.
Other Title:
American national standard Z21.64-1978 for direct vent central furnaces
Direct vent central furnaces
Copyright Claimant:
American Gas Association
Names:
American Gas Association (268 documents)
example document: Conservation of natural gas in the home

Addenda to American national standard Z21.47-1978 for gas-fired central furnaces (except direct vent and separated combustion system central furnaces)

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000664049 / 1981-02-18
Date of Publication:
October 31, 1980
Date of Creation:
1980
Title:
Addenda to American national standard Z21.47-1978 for gas-fired central furnaces (except direct vent and separated combustion system central furnaces) : A N S I Z21.47a-1980 / secretariat, American Gas Association.
Basis of Claim:
New Matter: revisions.
Previous Registration:
Prev. reg. 1979, TX 222-255.
Variant title:
Addenda to American national standard Z21.47-1978 for gas-fired central furnaces (except direct vent and separated
Other Title:
Gas-fired central furnaces (except direct vent and separated ...
American national standard Z21.47-1978 for gas-fired central furnaces (except direct vent and separated ...
Copyright Claimant:
American Gas Association
Names:
American Gas Association

Addenda to American national standard Z21.57-1978 for recreational vehicle cooking gas appliances

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000664052 / 1981-02-18
Date of Publication:
May 21, 1980
Date of Creation:
1979
Date in Notice:
notice: 1979
Title:
Addenda to American national standard Z21.57-1978 for recreational vehicle cooking gas appliances : A N S I Z21.57a-1979 / secretariat, American Gas Association.
Basis of Claim:
New Matter: revisions.
Previous Registration:
Prev. reg. 1979, TX 381-180.
Other Title:
American national standard Z21.57-1978 for recreational vehicle cooking gas appliances
Recreational vehicle cooking gas appliances
Copyright Claimant:
American Gas Association
Names:
American Gas Association (268 documents)
example document: National fuel gas code

Addenda to American national standard Z21.55-1979 for gas-fired sauna heaters

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000664053 / 1981-02-18
Date of Publication:
May 21, 1980
Date of Creation:
1980
Title:
Addenda to American national standard Z21.55-1979 for gas-fired sauna heaters : A N S I Z21.55a-1980 / secretariat, American Gas Association.
Basis of Claim:
New Matter: revisions.
Previous Registration:
Prev. reg. 1980, TX 420-420.
Other Title:
American national standard Z21.55-1979 for gas-fired sauna heaters
Gas-fired sauna heaters
Copyright Claimant:
American Gas Association
Names:
American Gas Association (268 documents)
example document: Natural gas vehicle safety survey--an update

Addenda to American national standard Z21.50-1979 for vented decorative gas appliances

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000664054 / 1981-02-18
Date of Publication:
May 21, 1980
Date of Creation:
1980
Title:
Addenda to American national standard Z21.50-1979 for vented decorative gas appliances : A N S I Z21.50a-1980 / secretariat, American Gas Association.
Basis of Claim:
New Matter: revisions.
Previous Registration:
Prev. reg. 1980, TX 420-416.
Other Title:
American national standard Z21.50-1979 for vented decorative gas appliances
Vented decorative gas appliances
Copyright Claimant:
American Gas Association
Names:
American Gas Association

Addenda to American national standard Z21.49-1979 for gas-fired gravity and fan type vented wall furnaces

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000664055 / 1981-02-18
Date of Publication:
May 21, 1980
Date of Creation:
1980
Title:
Addenda to American national standard Z21.49-1979 for gas-fired gravity and fan type vented wall furnaces : A N S I Z21.49a-1980 / secretariat, American Gas Association.
Basis of Claim:
New Matter: revisions.
Previous Registration:
Prev. reg. 1980, TX 420-415.
Other Title:
American national standard Z21.49-1979 for gas-fired gravity and fan type vented wall furnaces
Gas-fired gravity and fan type vented wall furnaces
Copyright Claimant:
American Gas Association
Names:
American Gas Association

Addenda to American national standard Z21.48-1979 for gas-fired gravity and fan type vented floor furnaces

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000664056 / 1981-02-18
Date of Publication:
May 21, 1980
Date of Creation:
1980
Title:
Addenda to American national standard Z21.48-1979 for gas-fired gravity and fan type vented floor furnaces : A N S I Z21.48a-1980 / secretariat, American Gas Association.
Basis of Claim:
New Matter: revisions.
Previous Registration:
Prev. reg. 1980, TX 420-413.
Other Title:
American national standard Z21.48-1979 for gas-fired gravity and fan type vented floor furnaces
Gas-fired gravity and fan type vented floor furnaces
Copyright Claimant:
American Gas Association
Names:
American Gas Association

Addenda to American national standard Z21.44-1977, Z21.44a-1979 for gas-fired gravity and fan type direct vent wall furnaces

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000664057 / 1981-02-18
Date of Publication:
May 21, 1980
Date of Creation:
1980
Title:
Addenda to American national standard Z21.44-1977, Z21.44a-1979 for gas-fired gravity and fan type direct vent wall furnaces : A N S I Z21.44b-1980 / secretariat, American Gas Association.
Basis of Claim:
New Matter: revisions.
Previous Registration:
Prev. reg. 1979, TX 381-179.
Variant title:
Addenda to American national standard Z21.44-1977, Z21.44a-1979 for gas-fired gravity and fan type direct vent wall
Other Title:
American national standard Z21.44-1977, Z21.44a-1979 for gas-fired gravity and fan type direct vent wall ...
Gas-fired gravity and fan type direct vent wall ...
Copyright Claimant:
American Gas Association
Names:
American Gas Association

Addenda to American national standard Z21.13-1977, Z21.13a-1979 for gas-fired low-pressure steam and hot water boilers

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000664058 / 1981-02-18
Date of Publication:
June 18, 1980
Date of Creation:
1979
Title:
Addenda to American national standard Z21.13-1977, Z21.13a-1979 for gas-fired low-pressure steam and hot water boilers : A N S I Z21.13b-1979 : formerly, American national standard for gas-fired low-pressure steam and hot water heating boilers / secretariat, American Gas Association.
Basis of Claim:
New Matter: revisions.
Previous Registration:
Prev. reg. 1980, TX 420-412.
Other Title:
American national standard for gas-fired low-pressure steam and hot water heating boilers
American national standard Z21.13-1977, Z21.13a-1979 for gas-fired low-pressure steam and hot water boilers
Gas-fired low-pressure steam and hot water boilers
Gas-fired low-pressure steam and hot water heating boilers
Copyright Claimant:
American Gas Association
Names:
American Gas Association (268 documents)
example document: American national standard for earthquake actuated automatic gas shutoff systems

Addenda to American national standard Z21.10.3-1975, Z21.10.3a-1978 for gas water heaters

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000664060 / 1981-02-18
Date of Publication:
June 18, 1980
Date of Creation:
1979
Date in Notice:
notice: 1979
Title:
Addenda to American national standard Z21.10.3-1975, Z21.10.3a-1978 for gas water heaters : v. II, Circulating tank, instantaneous, and large automatic storage water heaters : A N S I Z21.10.3b-1979 / secretariat, American Gas Association.
Basis of Claim:
New Matter: revisions.
Previous Registration:
Prev. reg. 1979, TX 381-177.
Other Title:
Circulating tank, instantaneous, and large automatic storage water heaters
American national standard Z21.10.3-1975, Z21.10.3a-1978 for gas water heaters
Gas water heaters
Copyright Claimant:
American Gas Association
Names:
American Gas Association (268 documents)
example document: National fuel gas code

Addenda to American national standard Z21.65-1978 for separated combustion system central furnaces

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000699964 / 1981-05-27
Date of Publication:
March 9, 1981
Date of Creation:
1980
Date in Notice:
notice: 1980
Title:
Addenda to American national standard Z21.65-1978 for separated combustion system central furnaces : A N S I Z83.10a-1980 / secretariat, American Gas Association.
Basis of Claim:
New Matter: "revisions throughout this text."
Previous Registration:
Prev. reg. 1979, TX 381-182.
Other Title:
Separated combustion system central furnaces
Copyright Claimant:
American Gas Association
Names:
American Gas Association (268 documents)
example document: Natural gas reserves of selected fields in the U. S. and of Canada

Addenda to American national standard Z83.8-1978, Z83.8a-1979 for gas unit heaters

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000699965 / 1981-05-27
Date of Publication:
March 9, 1981
Date of Creation:
1980
Date in Notice:
notice: 1980
Title:
Addenda to American national standard Z83.8-1978, Z83.8a-1979 for gas unit heaters : A N S I Z83.8b-1980 / secretariat, American Gas Association.
Basis of Claim:
New Matter: "revisions throughout this text."
Previous Registration:
Prev. reg. 1980, TX 420-407.
Copyright Claimant:
American Gas Association
Names:
American Gas Association

Addenda to American national standard Z83.9-1980 for gas-fired duct furnaces

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000746808 / 1981-08-12
Date of Publication:
March 9, 1981
Date of Creation:
1980
Date in Notice:
notice: 1980
Title:
Addenda to American national standard Z83.9-1980 for gas-fired duct furnaces : A N S I Z83.9a-1980 / secretariat, American Gas Association.
Basis of Claim:
New Matter: revisions.
Previous Registration:
Prev. reg. 1981, TX 664-059.
Other Title:
Gas-fired duct furnaces
American national standard Z83.9-1980 for gas-fired duct furnaces
Copyright Claimant:
American Gas Association
Names:
American Gas Association (268 documents)
example document: American national standard for gas appliance thermostats

Addenda to American national standard Z21.57-1978, Z21.57a-1979 for recreational vehicle cooking gas appliances

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000746809 / 1981-08-12
Date of Publication:
June 18, 1981
Date of Creation:
1981
Title:
Addenda to American national standard Z21.57-1978, Z21.57a-1979 for recreational vehicle cooking gas appliances : A N S I Z21.57b-1981 / secretariat, American Gas Association.
Basis of Claim:
New Matter: revisions.
Previous Registration:
Prev. reg. 1981, no. 664-052.
Other Title:
American national standard Z21.57-1978, Z21.57a-1979 for recreational vehicle cooking gas appliances
Recreational vehicle cooking gas appliances
Copyright Claimant:
American Gas Association
Names:
American Gas Association (268 documents)
example document: National fuel gas code, 1984 (N F P A 54)

Addenda to American national standard Z21.1-1978, Z21.1a-1979 for household cooking gas appliances

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000746810 / 1981-08-12
Date of Publication:
June 18, 1981
Date of Creation:
1981
Title:
Addenda to American national standard Z21.1-1978, Z21.1a-1979 for household cooking gas appliances : A N S I Z21.1b-1981 / secretariat, American Gas Association.
Basis of Claim:
New Matter: revisions.
Previous Registration:
Prev. reg. 1980, no. 558-542.
Other Title:
Household cooking gas appliances
American national standard Z21.1-1978, Z21.1a-1979 for household cooking gas appliances
Copyright Claimant:
American Gas Association
Names:
American Gas Association

Addenda to American national standard Z21.55-1979, Z21.55a-1980 for gas-fired sauna heaters

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000746811 / 1981-08-12
Date of Publication:
June 18, 1981
Date of Creation:
1981
Title:
Addenda to American national standard Z21.55-1979, Z21.55a-1980 for gas-fired sauna heaters : A N S I Z21.55b-1981 / secretariat, American Gas Association.
Basis of Claim:
New Matter: revisions.
Previous Registration:
Prev. reg. 1981, [TX] 664-053.
Other Title:
American national standard Z21.55-1979, Z21.55a-1980 for gas-fired sauna heaters
Gas-fired sauna heaters
Copyright Claimant:
American Gas Association
Names:
American Gas Association

Analysis of natural gas producer/interstate pipeline contracts

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000763945 / 1981-09-11
Date of Publication:
July 1, 1981
Date of Creation:
1981
Title:
Analysis of natural gas producer/interstate pipeline contracts : prepared for the American Gas Association / prepared by Decision Analysis Corporation.
Description:
20 p.
Copyright Claimant:
American Gas Association
Notes:
Summary.
Authorship on Application:
entire text: American Gas Association, employer for hire of Decision Analysis Corporation.
Names:
Decision Analysis Corporation
American Gas Association (268 documents)
example document: American national standard for the thickness design of ductile-iron pipe

Fundamentals of gas combustion work book

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000767656 / 1981-09-17
Date of Publication:
August 1, 1981
Date of Creation:
1981
Title:
Fundamentals of gas combustion work book : operating section report.
Description:
34 p.
Copyright Claimant:
American Gas Association
Names:
American Gas Association (268 documents)
example document: Natural gas reserves of selected fields in the US and of Canada

Addenda to American national standard Z21.41-1978 for quick-disconnect devices for use with gas fuel

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000821804 / 1981-12-18
Date of Publication:
September 17, 1981
Date of Creation:
1981
Title:
Addenda to American national standard Z21.41-1978 for quick-disconnect devices for use with gas fuel : A N S I Z21.41a-1981 / secretariat, American Gas Association.
Basis of Claim:
New Matter: "revisions throughout this text."
Previous Registration:
Prev. reg. 1979, TX 381-174.
Other Title:
American national standard Z21.41-1978 for quick-disconnect devices for use with gas fuel
Quick-disconnect devices for use with gas fuel
Copyright Claimant:
American Gas Association
Names:
American Gas Association (268 documents)
example document: American national standard for direct gas-fired make-up heaters

Addenda to American national standard Z21.48-1979, Z21.48a-1980 for gas-fired gravity and fan type floor furnaces

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000821805 / 1981-12-18
Date of Publication:
September 17, 1981
Date of Creation:
1981
Title:
Addenda to American national standard Z21.48-1979, Z21.48a-1980 for gas-fired gravity and fan type floor furnaces : A N S I Z21.48b-1981 / secretariat, American Gas Association.
Basis of Claim:
New Matter: "revisions throughout this text."
Previous Registration:
Prev. reg. 1981, TX 664-056.
Other Title:
American national standard Z21.48-1979, Z21.48a-1980 for gas-fired gravity and fan type floor furnaces
Gas-fired gravity and fan type floor furnaces
Copyright Claimant:
American Gas Association
Names:
American Gas Association (268 documents)
example document: American national standard for gas water heaters

Addenda to American national standard Z21.67-1978 for mechanically actuated automatic vent damper devices for use with gas-fired appliances

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000821808 / 1981-12-18
Date of Publication:
December 1, 1981
Date of Creation:
1981
Title:
Addenda to American national standard Z21.67-1978 for mechanically actuated automatic vent damper devices for use with gas-fired appliances : A N S I Z21.67a-1981 / secretariat, American Gas Association.
Basis of Claim:
New Matter: "revisions throughout this text."
Previous Registration:
Prev. reg. 1979, TX 349-666.
Variant title:
Addenda to American national standard Z21.67-1978 for mechanically actuated automatic vent damper devices
Other Title:
American national standard Z21.67-1978 for mechanically actuated automatic vent damper devices ....
Mechanically actuated automatic vent damper devices for use with gas-fired appliances
Copyright Claimant:
American Gas Association
Names:
American Gas Association (268 documents)
example document: Fundamentals of electricity

Addenda to American national standard Z21.68-1978 for thermallyactuated automatic vent damper devices for use with gas-fired appliances

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000821809 / 1981-12-18
Date of Publication:
December 1, 1981
Date of Creation:
1981
Title:
Addenda to American national standard Z21.68-1978 for thermallyactuated automatic vent damper devices for use with gas-fired appliances : A N S I Z21.68a-1981 / secretariat, American Gas Association.
Basis of Claim:
New Matter: "revisions throughout this text."
Previous Registration:
Prev. reg. 1979, TX 349-660.
Variant title:
Addenda to American national standard Z21.68-1978 for thermallyactuated automatic vent damper devices
Other Title:
American national standard Z21.68-1978 for thermally actuated automatic vent damper devices ....
Thermally actuated automatic vent damper devices for use with gas-fired appliances
Copyright Claimant:
American Gas Association
Names:
American Gas Association (268 documents)
example document: National fuel gas code

Addenda to American national standard Z21.63-1978 for portable camp heaters of other than the catalytic type for use with liquefied petroleum gases

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000821810 / 1981-12-18
Date of Publication:
November 20, 1981
Date of Creation:
1981
Title:
Addenda to American national standard Z21.63-1978 for portable camp heaters of other than the catalytic type for use with liquefied petroleum gases : A N S I Z21.63a-1981 / secretariat, American Gas Association.
Basis of Claim:
New Matter: "revisions throughout this text."
Previous Registration:
Prev. reg. 1979, TX 222-251.
Variant title:
Addenda to American national standard Z21.63-1978 for portable camp heaters of other than the catalytic type
Other Title:
American national standard Z21.63-1978 for portable camp heaters of other than the catalytic type ....
Portable camp heaters of other than the catalytic type for use with liquefied petroleum gases
Copyright Claimant:
American Gas Association
Names:
American Gas Association

Addenda to American national standard Z21.62-1977 for portable catalytic camp heaters for use with propane gas

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000821811 / 1981-12-18
Date of Publication:
November 20, 1981
Date of Creation:
1981
Title:
Addenda to American national standard Z21.62-1977 for portable catalytic camp heaters for use with propane gas : A N S I Z21.62a-1981 / secretariat, American Gas Association.
Basis of Claim:
New Matter: "revisions throughout this text."
Previous Registration:
Prev. reg. 1979, TX 222-260.
Other Title:
American national standard Z21.62-1977 for portable catalytic camp heaters for use with propane gas
Portable catalytic camp heaters for use with propane gas
Copyright Claimant:
American Gas Association
Names:
American Gas Association

Addenda to American national standard Z21.17-1979 for domestic gas conversion burners

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000821813 / 1981-12-18
Date of Publication:
October 22, 1981
Date of Creation:
1981
Title:
Addenda to American national standard Z21.17-1979 for domestic gas conversion burners : A N S I Z21.17a-1981 / secretariat, American Gas Association.
Basis of Claim:
New Matter: "revisions throughout this text."
Previous Registration:
Prev. reg. 1980, TX 420-414.
Other Title:
American national standard Z21.17-1979 for domestic gas conversion burners
Domestic gas conversion burners
Copyright Claimant:
American Gas Association
Names:
American Gas Association

Addenda to American national standard Z21.56-1979 for gas-fired swimming pool heaters

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000821814 / 1981-12-18
Date of Publication:
October 22, 1981
Date of Creation:
1981
Title:
Addenda to American national standard Z21.56-1979 for gas-fired swimming pool heaters : A N S I Z21.56a-1981 / secretariat, American Gas Association.
Basis of Claim:
New Matter: "revisions throughout this text."
Previous Registration:
Prev. reg. 1981, TX 664-051.
Other Title:
American national standard Z21.56-1979 for gas-fired swimming pool heaters
Gas-fired swimming pool heaters
Copyright Claimant:
American Gas Association
Names:
American Gas Association

Addenda to American national standard Z21.58-1972, Z21.58a-1974 for outdoor cooking gas appliances

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000821815 / 1981-12-18
Date of Publication:
October 22, 1981
Date of Creation:
1981
Title:
Addenda to American national standard Z21.58-1972, Z21.58a-1974 for outdoor cooking gas appliances : A N S I Z21.58b-1981 / secretariat, American Gas Association.
Basis of Claim:
New Matter: "revisions throughout this text."
Previous Registration:
Prev. reg. 1975, A622752.
Other Title:
American national standard Z21.58-1972, Z21.58a-1974 for outdoor cooking gas appliances
Outdoor cooking gas appliances
Copyright Claimant:
American Gas Association
Names:
American Gas Association (268 documents)
example document: American national standard for gas appliance thermostats

Addenda to American national standard Z21.61-1977, Z21.61a-1979 for gas-fired toilets

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000821816 / 1981-12-18
Date of Publication:
October 22, 1981
Date of Creation:
1981
Title:
Addenda to American national standard Z21.61-1977, Z21.61a-1979 for gas-fired toilets : A N S I Z21.61b-1981 / secretariat, American Gas Association.
Basis of Claim:
New Matter: "revisions throughout this text."
Previous Registration:
Prev. reg. 1979, TX 381-172.
Other Title:
American national standard Z21.61-1977, Z21.61a-1979 for gas-fired toilets
Gas-fired toilets
Copyright Claimant:
American Gas Association
Names:
American Gas Association (268 documents)
example document: National fuel gas code

Addenda to American national standard Z21.49-1979, Z21.49a-1980 for gas-fired gravity and fan type vented wall furnaces

Type of Work:
Non-dramatic literary work
Registration Number / Date:
TX0000821818 / 1981-12-18
Date of Publication:
September 17, 1981
Date of Creation:
1981
Title:
Addenda to American national standard Z21.49-1979, Z21.49a-1980 for gas-fired gravity and fan type vented wall furnaces : A N S I Z21.49b-1981 / secretariat, American Gas Association.
Basis of Claim:
New Matter: "revisions throughout this text."
Previous Registration:
Prev. reg. 1981, TX 664-055.
Other Title:
American national standard Z21.49-1979, Z21.49a-1980 for gas-fired gravity and fan type vented wall furnaces
Gas-fired gravity and fan type vented wall furnaces
Copyright Claimant:
American Gas Association
Names:
American Gas Association (268 documents)
example document: American national standard for hotel and restaurant gas deep fat fryers
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