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DYNAMIC BALANCING MACHINES; TIME MEASURING SWITCHES; MEASURING APPARATUS, MACHINES AND INSTRUMENTS FOR MEASURING LENGTH, ANGLE, TENSION, STRESS AND STRAIN, VOLUME, WEIGHT, LIQUID AND GAS LEVEL, PRESSURE, LIGHT INTENSITY, HEAT, SPEED AND ACCELERATION-NAMELY, CALIPERS AND PARTS THEREFOR, CALIPER GAUGES, THICKNESS GAUGES, HOLE GAUGES, MICROMETERS, PLANIMETERS, DIAL INDICATORS, SEXTANTS, TENSIOMETERS, GAS METERS, WEIGHING MACHINES, MANOMETERS, VOLTMETERS, PHOTOMETERS, ACTINOMETERS, EXPOSURE METERS AND SPEEDOMETERS, TIME REGISTERING INSTRUMENTS; SURFACE FINISH TESTING AND MEASURING INSTRUMENTS; STRADDLE GAUGES, THREAD MEASURING INSTRUMENTS, TAPER TESTING INSTRUMENTS, COMPARATORS, RADIUS DEVIATION INSTRUMENTS, INSTRUMENTS FOR MEASURING AND CHECKING PLANE SURFACE AND EDGE PARALLELISM, DIMENSIONAL GAUGES, LEVELS, RULES, MEASURING TAPE, CONTROL INSTRUMENTS FOR CONTROLLING THE DIMENSIONS OF OBJECTS, MEASURING INSTRUMENTS FOR MEASURING OBJECTS, GAUGES FOR MEASURING AND COMPARING THE DIMENSIONS OF OBJECTS, TEMPERATURE CONTROL DEVICES, THERMOSTAT-OPERATED MECHANISM FOR AUTOMATICALLY ADJUSTING THE TEMPERATURE AND SPEED OF MOVEMENT OF FLUIDS AND TELEINDICATOR MECHANISMS FOR TOOLS, ELECTRICALLY AND PNEUMATICALLY OPERATED APPARATUS FOR USE IN AUTOMATICALLY MEASURING AND CONTROLLING THE WORK OF MACHINE TOOLS