GENERAL RADIO CO. GR

STANDARDS OF RESISTANCE, INDUCTANCE, AND CAPITANCE FOR MEASURING PURPOSES, DECADE BRIDGES, SLIDE-WIRE BRIDGES, CAPACITY BRIDGES AND METERS, HOT-WIRE METERS, WAVE METERS, AUDIBILITY METERS, SPECIAL MEASURING INSTRUMENTS FOR MAKING MEASUREMENTS AT AUDIO AND RADIO FREQUENCIES, ELECTRICAL COMPENSATORS FOR SUBMARINE DETECTION AND DEPTH SOUND RANGING, AND D'ARSONVAL METERS