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ANSI C78.1401-2004 (S2023)

Electric Lamps -Dimensions for Projection Lamps -Double-Contact, Medium Ring (Special B), Base-up Type

This Standard establishes the dimensions essential to the interchangeability of lamps of the double-contact, medium ring (Special B), base-up type. It is not intended to prescribe either operating characteristics or details of design, such as the shape of the ventilation ports or the method of attachment of the prefocus ring to the base.

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NEMA: National Electrical Manufacturers Association [nema]

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