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BS EN 60061. Lamp caps and holders together with gauges for the control of interchangeability and safety. Revision of 7004-21A-3 for E26, 7004-24A-2 for E39 and 7004-26-3 for E17|Designations, Lamp caps, Lighting equipment, Design, Verification, Electric lamps, Dimensions, Bayonet lamp caps, Pin lamp caps, Screw lamp caps, Electrical safety, Gauges, Interchangeability

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