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Electric lamp, incandescent / manufacture Electric lamp, incandescent / manufacture

Cotton base of a filament, one of set of specimens illustrating manufacture of incandescent electric lamps, by Edison and Swan Electric Light Co., c. 1900

Electric lamp, incandescent / manufacture Electric lamp, incandescent / manufacture

Lamp ready for exhausting, one of set of specimens illustrating manufacture of incandescent electric lamps, by Edison and Swan Electric Light Co., c. 1900

Electric lamp, incandescent / manufacture Electric lamp, incandescent / manufacture

Lamp ready for exhausting, one of set of specimens illustrating manufacture of incandescent electric lamps, by Edison and Swan Electric Light Co., c. 1900

Electric lamp, incandescent / manufacture Electric lamp, incandescent / manufacture

Lamp sealed and ready for testing, one of set of specimens illustrating manufacture of incandescent electric lamps, by Edison and Swan Electric Light Co., c. 1900

Electric lamp, incandescent / manufacture Electric lamp, incandescent / manufacture

Lamp sealed and ready for testing, one of set of specimens illustrating manufacture of incandescent electric lamps, by Edison and Swan Electric Light Co., c. 1900

Electric lamp, incandescent / manufacture Electric lamp, incandescent / manufacture

Finished lamp, one of set of specimens illustrating manufacture of incandescent electric lamps, by Edison and Swan Electric Light Co., c. 1900

Electric lamp, incandescent / manufacture Electric lamp, incandescent / manufacture

Finished lamp, one of set of specimens illustrating manufacture of incandescent electric lamps, by Edison and Swan Electric Light Co., c. 1900

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