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Description: Lamp holder, Swan's patent spring and hook holder of the concentric or single wire type with a 7/16 inch diameter internal screw thread for connection to other fittings. Manufactured by the Swan United Electric Light Co. Ltd., in 1883. Part: holder, Material: metal, copper alloy, brass Part: holder, Material: wood Source: Tyne & Wear Archives & Museums Identifier: emu.ecatalogue.science&industry.482228 Go to resource More Like this...
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