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, SPEED AND ACCELERATION-NAMELY, CALIPERS AND PARTS THEREFOR, CALIPER GAUGES, THICKNESS GAUGES, HOLE GAUGES, MICROMETERS, PLANIMETERS, SEXTANTS, TENSIONMETERS, GAS-METERS, WEIGHING MACHINES, MANOMETERS, VOLTMETERS, PHOTOMETERS, ACTINOMETERS, EXPOSURE METERS AND SPEEDOMETERS; ...