SERVICEMAN
THERMOMETERS, PRESSURE GAUGES, RECORDING INSTRUMENTS FOR RECORDING CONDITIONS SUCH AS TEMPERATURE, PRESSURE, HUMIDITY AND TIMES OR CYCLES OF OPERATION OF DEVICES, SOUND DETECTION TESTERS FOR LOCALIZING AND IDENTIFYING MECHANICAL SOUNDS, AND ELECTRIC TIMERS FOR ASCERTAINING OPERATING TIMES AND CYCLES OF ELECTRICAL EQUIPMENT
Expired · August 25, 1953 · 71652291 ·