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| Keywords: Edison's lamp.jpg fig 432 1886 Fig 431 at http //www archive org/stream/electricityinse01wormgoog page/n496/mode/1up page 458 in Electricity in the service of man by Alfred Ritter von Urbanitzky edited with copious additions by Richard Wormell Published by Cassell Company 1886 Unknown illustrator PD-old-100 Early incandescent light bulbs Scans from 'Electricity in the service of man' 1886 Light bulb filaments | ||||
