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About This Item
Document History
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ANSI C78.21-2022
American National Standard for Incandescent Lamps— PAR and R Shapes- Most Recent
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ANSI C78.21-2011 (R2016)
American National Standard for Electric Lamps - PAR and R Shapes- Historical Version
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ANSI/ANSLG C78.21-2003
American National Standard for Electric Lamps - PAR and R Shapes- Historical Version
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ANSI C78.21-1995
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American National Standard for Incandescent Lamps - PAR and R Shapes- Historical Version