72334850
Aug 8, 1969
Oct 6, 1970
ELECTRICAL MEASURING AND POWER INSTRUMENTS, COMPONENTS AND SYSTEMS-NAMELY, ELECTRICAL SELF-POWERED MEASURING UNITS FOR MEASURING ELECTRICAL PARAMETERS; A COMBINATION VOLTMETERPOWER SUPPLY UNIT AND COMPONENTS THEREOF; POWER SUPPLIES WITH PLUG-IN METERING COMPONENTS; AND DIFFERENTIAL VOLTMETERS
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