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細節
An early Edison electric lamp,
with paper label 20c New Type Edison Lamp. Patented Feb 14, 1880. Other Edison Patents, the bayonet-fitting cap in lacquered brass holder; and a later Edsion lamp, with screw-cap (2)
with paper label 20c New Type Edison Lamp. Patented Feb 14, 1880. Other Edison Patents, the bayonet-fitting cap in lacquered brass holder; and a later Edsion lamp, with screw-cap (2)