72357671
Apr 23, 1970
Dec 7, 1971
JEWELL ELECTRICAL INSTRUMENTS INC.
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METER RELAYS
AMMETERS, MILLIAMETERS, MICROAMMETERS, VOLTMETERS, VOLUME UNIT METERS (KNOWN GENERALLY AS V.U. METERS), MILLIVOLTMETERS, NULL INDICATORS, AIRCRAFT NAVAGATIONAL INSTRUMENTS, PYROMETERS, AND TACHOMETERS
ELAPSED TIME INDICATORS FOR CHECKING THE TIME OF AN OPERATION OR FUNCTION