9 PHOTOTRANSISTORS AND OPTO-PAIRED SWITCHING COMPONENTS FOR COMPUTER CARD TAPE READERS, POSITION INDICATORS, AND SHAFT ENCODERS; PHOTOTRANSISTOR ARRAYS AND TRANSDUCERS FOR CARD/TAPE READOUTS AND PHOTOSENSING CONTROL ASSEMBLIES; SILICON PHOTOVOLTAIC CELLS AND ARRAYS FOR SOLAR ENERGY CONVERSION, LIGHT ACTUATED DEVICES AND COLOR DISCRIMINATION