SIGNAL PHASE COMPARISON UNITS WHICH PRODUCE AN OUTPUT SIGNAL PROPORTIONAL TO THE PHASE DIFFERENCE BETWEEN A RECEIVED AND A REFERENCE SIGNAL; DEMODULATORS; INERTIAL SWITCHES; POWER INVERTERS; POWER SUPPLIES; PRINTED CIRCUIT CABLES, HEATER UNITS, MULTILAYER AND FLEXIBLE UNITS; INFORMATION DISPLAY SYSTEMS WHEREBY ALPHANUMERICS AND SYMBOLS ARE PRESENTED ON A CRT DISPLAY SCREEN; SERVO AMPLIFIERS; LIGHT SENSING SYSTEMS FOR EDITING AND CONTROLLING ELECTRONIC DISPLAYS; ELECTRONIC FORCE MOTORS; FLOW SWITCHES; SERVO ACTUATORS; AND MICROWAVE COMPONENTS-NAMELY, FREQUENCY SOURCES AND MULTIPLIER UNITS, MODULATOR UNITS, OSCILLATOR UNITS, SIGNAL SWITCH UNITS, SWITCH CONTROL CIRCUITS AND DRIVERS, SIGNAL DETECTOR UNITS, POWER DIVIDER UNITS, ATTENUATORS, FILTER UNITS, MIXER UNITS, PHASE SHIFTERS, HYBRID DEVICES, CIRCULATORS, OSCILLATORS, ROTARY JOINTS, TRANSMISSION LINES, AND MICROWAVE MODULES