HUMIDISTATS; THERMOSTATS; THERMOMETERS; SENSORS FOR TEMPERATURE, HUMIDITY, PRESSURE, FIRE, AND SMOKE; INDICATORS FOR TEMPERATURE, HUMIDITY, PRESSURE, FIRE, AND SMOKE; FIRE DETECTION SYSTEMS, COMPRISING, VARIOUSLY, IONIZATION DETECTORS, AIR DUCT AND FILTER DUCT IONIZATION DETECTORS, FLAME DETECTORS, DETECTOR RELEASING UNITS, THERMAL DETECTORS, FIRE INDICATING UNITS, CONTROL PANELS, ANNUNCIATORS, BELLS, ALARMS, FIRE-DOOR HOLDERS, CEILING FIXTURES FOR DETECTORS, ALARM LAMPS, EMERGENCY POWER SUPPLIES, MANUAL FIRE STATIONS, AND ENCLOSURES; AIR GAUGES, PANELS, AND CONSOLE-MOUNTED INDICATORS AND SENSORS, FOR HEATING, VENTILATING, AIR CONDITIONING, AND PROCESS CONTROL; METERS; CONTROL PANELS, AND CONTROL SYSTEMS, FOR HEATING, VENTILATING, AND AIR CONDITIONING SYSTEMS; ELECTRIC CONTROLLERS FOR HUMIDITY, AND TEMPERATURE; DECADE RESISTANCE BOXES; FLUIDIC CONTROLS; FLUIDIC SYSTEMS; WATER TEMPERATURE CONTROLS; PRESSURE GAUGES; PRESSURE SELECTORS; POSITION INDICATOR SWITCHES AND NETWORKS; ELECTRIC NETWORKS FOR TIME PROPORTIONING; TIME PROPORTIONING SWITCHES; PRESSURE TRANSMITTORS AND INDICATORS; AND PARTS AND COMPONENTS FOR ALL OF THE FOREGOING