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Tools and Hardware2435 of 3868U.S. Military Compass and Match boxSHELHAM PREMIUM STOCK KNIFE
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Posted 3 years ago


(93 items)

These are DC voltage standards which were used to calibrate voltmeters and other electronic items. These are old 40's -50's. They measure 1.o16 volts dc now using a digital volt meter. Better standards are used now and these use mercury. The liquid is potassium hydroxide I believe. Mfg by EPLEY CO.

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