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http://omekax.grinnell.edu/PhysicsInstrumentMuseum/files/original/ae965a64378e7bb7e8501131ebdf8443.JPG image/jpeg thumbnail

DC VoltAmmeter

DC VoltAmmeter Model I-50
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DC Voltmeter

DC Voltmeter 0.0 to 7.5 Volts Cat. No. 3057K, Serial No. 37257