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ANSI C78.390-2006 (S2020)
Electric Lamps - Method of Designation for Electric Lamps - Miniature and Sealed-Beam Incandescent Lamps
This standard describes a system for the designation of miniature and sealed-beam lamps. A form is provided for the use of lamp manufacturers to request a designation assignment, alternative, or change.
NEMA: National Electrical Manufacturers Association [nema]