SELF-CONTAINED PHOTOELECTRIC SCANNERS AND PHOTOELECTRIC CONTROL DEVICES AND COMPONENTS NAMELY SENSORS, LIGHT SWITCHES, REGISTER MARK AND BAR CODE SCANNERS, COUNTERS, DETECTORS AND REFLECTORS

NON-CONTACT SENSING SYSTEMS-NAMELY, SENSING UNITS, SCANNERS, SWITCHES, AMPLIFIER CONTROL UNITS, DETECTION SYSTEMS, PHOTOELECTRIC CONTROL UNITS, COUNTERS, ULTRASONIC BARRIER UNITS, INDUCTIVE SENSING UNITS