Sawyer electric lamp 205144.jpg
US Patent Office /  William E. Sawyer and Albon Man
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Sawyer electric lamp 205144, William E. Sawyer electric lamp, patent US 205144, 1878 filament electric lamp
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Sawyer electric lamp 205144, Patent drawings
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ソーヤー電灯 205144、ウィリアム・E・ソーヤー電灯、特許US 205144、1878年フィラメント電灯
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ソーヤー電灯 205144、特許図面
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electric lamp incandescent sawyer incandescent light bulb