73153546
Dec 27, 1977
Aug 18, 1981
Barometers; Controllers for Industrial Processes; Density Controllers, Indicators, Measuring Instruments, Monitors and Transmitters, for Liquids and/or Mixtures of Liquids and Solids: Hydrometers; Hygrometers; Instrument Carrying Cases; Interface Detectors; Level Alarms, Controllers, Detectors, Indicators, Monitors, Probes and Transmitters, for Use with Liquids and/or Powders and/or Granules; Manometers, Pressure Gauges, Process Control Status Alarms, Indicators and Monitors; Psychrometers; Rain Gauges; Relays, Electromagnetic and Solid-State; Snow Gauges; Specific Gravity Controllers, Indicators, Measuring Instruments, Monitors and Transmitters; Thermal Switches; Thermometers; Thermoregulators; Thermostats; Vacuum Gauges; and Parts Thereof
Electrical and Scientific Apparatus