ANSI-Y32.9 › Complete Document History
Graphic Symbols for Electrical Wiring & Layout Diagrams Usedin Architecture & Building
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1972 R89 EDITION - REAFFIRMED IN 1989 - Jan. 1, 1989
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Obsolete Revision Information: |
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1972 EDITION - GRAPHIC SYMBOLS FOR ELECTRICAL - June 21, 1972
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