ELECTRIC DAMPER AND VALVE ACTUATORS; THERMAL VALVE AND DAMPER ACTUATORS; ELECTRIC HYDRAULIC VALVE AND DAMPER ACTUATORS; ELECTRIC-PRESSURE TRANSDUCERS; PRESSURE-ELECTRIC SWITCHES; PRESSURE-ELECTRIC TRANSDUCERS; ELECTRICAL CONTACTORS; SERVO UNITS; MOTOR CONTROLS; FIRE, SMOKE, AND HEAT, DETECTOR AND ALARM SYSTEMS; POSITION INDICATOR SWITCHES AND NETWORKS; AMPLIFIERS; CURRENT-TO-VOLTAGE CONVERTERS; VOLTAGE LIMITERS; REMOTE SET POINT CONTROLS; RESET CONTROLS; SIGNAL DISCRIMINATORS; TRANSFORMERS; AC AND DC POWER SUPPLIES; DATA ACQUISITION AND DATA TRANSMISSION SYSTEMS; ELECTRICALLY-OPERATED INDICATORS FOR TEMPERATURE, PRESSURE, AND HUMIDITY; ELECTRIC AND SOLID STATE SWITCHES AND RELAYS; ELECTRIC AND SOLID STATE LIMIT SWITCHES AND CONTROLS; ELECTRIC OVERLOAD CONTROLS; SURVEILLANCE SYSTEMS COMPRISING ELECTRICAL SIGNALLING BETWEEN REMOTE AREAS AND A CONTROL STATION; ELECTRONIC CONTROLLERS FOR MOTOR SPEED, STATIC PRESSURE, AND LOAD LIMITING; ELECTROHYDRAULIC POWER PACKS; ELECTRIC NETWORKS FOR POSITION INDICATOR, OUT-PUT LIMITING, REVERSING, SEQUENCING, STAGING; SOLENOID VALVE OPERATORS; AND PARTS AND COMPONENTS FOR ALL OF THE FOREGOING