DURANT

COUNTING AND COUNT/CONTROL INSTRUMENTS AND APPARATUS OF THE MECHANICAL, ELECTRICAL, ELECTROMECHANICAL AND ELECTRONIC TYPES FOR PROVIDING COUNTING, READOUT AND/OR CONTROL FUNCTIONS-NAMELY, REVOLUTION AND STROKE COUNTERS, MODULAR DECADE COUNTERS, PREDETERMINED COUNTERS AND COUNT/CONTROL APPARATUS, DUAL LEVEL AND PROGRAMMABLE COUNT/CONTROL APPARATUS, SCALER AND ERROR CORRECTING APPARATUS, TOTALIZERS, RATEMETERS, TACHOMETERS, RATE/RATIO INDICATORS, PUSHBUTTON SELECTOR SWITCHES, SINGLE AND SIDE BY SIDE NUMERAL WHEEL ASSEMBLIES, PARTS THEREOF AND ACCESSORIES THEREFOR COMPRISING: TRANSDUCERS, ROTARY AND LINEAL CONTACTORS, ELECTRIC SWITCHES, SHAFT ENCODERS, PHOTOELECTRIC SENSORS, MAGNETIC PICK-UP APPARATUS, MAGNETIC PROXIMITY SENSORS, READOUT DISPLAY APPARATUS, INPUT SIGNAL CONDITIONERS AND PROCESSORS, POWER SUPPLIES HOUSING AND BEZELS