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ANSI C78.1401
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ANSI C78.1401 4th Edition, January 1, 2004 Electric Lamps — Dimensions for Projection Lamps—Double-Contact, Medium Ring (Special B), Base-up Type
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Description / Abstract:
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.