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| Applied Research Laboratories, Inc. (ARL) (recognition terminated effective ) | | The abbreviation "NRTL" must
appear below the ARL mark. |
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| Canadian Standards Association (CSA) |
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| | Marks above used for products meeting only U.S. standards | Marks above used for products meeting both U.S. and Canadian standards |
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| | Mark above used for gas-fueled products meeting U.S. standards2 | |
| Canadian Standards Association (CSA)(mark formerly used by the American Gas Association (AGA), exclusively licensed to CSA until June 30, 2001) | | |
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| Communication Certification Laboratory, Inc. (CCL) | | |
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| Curtis-Straus LLC (CSL) | Marks below used for products meeting only U.S. standards (see note) | Mark below used for products meeting both U.S. and Canadian standards (see note) |
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| Original mark (use allowed until May 1, 2010) | | |
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Electrical Reliability Services, Inc. (ERS)
(also known as eti Conformity Services and formerly Electro-Test, Inc. (ETI)) (recognition terminated effective ) | | |
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Entela, Inc.
(Voluntary termination effective - acquired by the parent company of ITSNA) | Entela marks are now being used by ITSNA. See ITSNA marks below. |
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| FM Global Technologies LLC (FM) (also known as FM Approvals and formerly Factory Mutual Research Corporation) | Mark below used for products meeting only U.S. standards | Mark below used for products meeting both U.S. and Canadian standards |
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| Intertek Testing Services NA, Inc. (ITSNA) (formerly ETL Testing Laboratories, Inc.) | Marks below used for products meeting only U.S. standards | Marks below used for products meeting both U.S. and Canadian standards |