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ANTIQUE 1895 THOMSON ALTERNATING VOLTMETER (BRASS?) I am uncertain what this would be used for, but it's an interesting meter by General Electric Co., USA. The front has a series of numbers on the left-hand side: 0203040. The measurements graduate up in series of 10 up to 150. Written on the front is: Thomson Alternating Voltmeter, Patented July 16, 1895, Patents applied for No. 3354, General Electric Co., USA.
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