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Document History

  1. ANSI C78.21-2011 (R2016)


    American National Standard for Electric Lamps - PAR and R Shapes

    • Most Recent
  2. ANSI/ANSLG C78.21-2003


    American National Standard for Electric Lamps - PAR and R Shapes

    • Historical Version
  3. ANSI C78.21-1995

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    American National Standard for Incandescent Lamps - PAR and R Shapes

    • Historical Version