TEMPERATURE ACTUATED CONTROL DEVICES, NAMELY, CONTROLLERS, INDICATORS, PROBES, TRANSFORMERS, ZERO CROSSOVER FIRING UNITS, AND PROCESS ALARMS FOR CONTROL AND INDICATION OF TEMPERATURE DEPENDENT PROCESSES; THERMOELECTRIC TRANSDUCERS; ELECTRONIC PROCESS CONTROLLERS FOR IN-PROCESS CONTROLLING OF VARIOUS PHYSICAL ENVIRONMENTAL PROCESS VARIABLES INCLUDING PRESSURE, TEMPERATURE, PH, HUMIDITY, POSITION, AC AND/OR DC VOLTAGE, AND AC AND/OR DC CURRENT; ELECTRONIC TEMPERATURE CONTROLS; THERMOSTAT TEMPERATURE CONTROLS FOR IN-PROCESS CONTROLLING OF VARIOUS PHYSICAL ENVIRONMENTAL PROCESS VARIABLES INCLUDING PRESSURE, TEMPERATURE, PH, HUMIDITY, POSITION, AC AND/OR DC VOLTAGE, AND AC AND/OR DC CURRENT; ELECTRONIC TEMPERATURE INDICATORS, NAMELY, ANALOG AND DIGITAL TEMPERATURE DISPLAYS; INFRARED THERMOMETERS FOR NON-MEDICAL USE; THERMOCOUPLE THERMOMETERS FOR NON-MEDICAL USE; TEMPERATURE SENSORS, NAMELY, THERMOCOUPLES AND RESISTANCE TEMPERATURE DETECTOR DEVICES; ELECTRICAL CONTROLLERS FOR CONTROLLING MOTORS, LEVEL CONTROLLERS, POSITION ACTUATORS, DAMPERS, VALVES, ALARMS, TIMING CIRCUITS AND RECORDERS; ELECTRONIC RELAYS AND SWITCHES FOR USE WITH PROCESS CONTROL EQUIPMENT; MERCURY DISPLACEMENT SWITCHES; TRANSMITTERS, NAMELY, PROCESS TRANSMITTERS FOR THE ISOLATION OF INPUT ELECTRICAL SIGNALS FROM THE RETRANSMISSION OF THE ELECTRICAL SIGNALS; TRANSMITTERS FOR THE ISOLATION, DISPLAY AND RETRANSMISSION OF ELECTRICAL SIGNALS; DETECTORS FOR INDICATING WHEN CURRENT IS FLOWING THROUGH A CIRCUIT; ELECTRICAL SIGNAL CONVERTERS; STRIP CHART DATA RECORDERS; CIRCULAR CHART RECORDERS; ELECTRONIC DATA RECORDERS; ELECTRICAL POWER FILTERS, NAMELY, LINE FILTERS; NOISE SUPPRESSORS FOR SUPPRESSING WIDE BAND ELECTRICAL CONDUCTED NOISE; AND PARTS THEREFOR