Sawyer 1878 electric meter.jpg
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Sawyer 1878 electric meter, Sawyer 1878 electric meter, Sawyer 1878 commercial electric meter
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Sawyer 1878 electric meter, Black and white sketches, Electricity meters (kWh)
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ソーヤー1878電解計、ソーヤー1878電解計、ソーヤー1878電解計
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ソイヤー1878電動計、白黒図、電気メーター(kWh)
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electric meter sawyer electric lamp