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Preface The standards set forth herein apply to the first edition of the Standard for Combination Gas Controls for Gas Appliances, ANSI Z21.78-1997 CGA 6.20-M97, and Addenda Z21.78a-1998 · CGA 6.20a-M98, and supersede corresponding standards therein. Following their preparation by the supervising subcommittee, they were accepted by ANSI, and the Inter provincial Gas Advisory Council, and subsequently approved.
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