LIMITING, SIGNALLING AND SAFETY DEVICES-NAMELY, [ LIGHT ACTUATED FLAME DETECTORS AND ] MERCURY CONTACT DEVICES, TEMPERATURE ACTUATED FLAME DETECTORS, BAROMETRICALLY OPERATED DEVICES, THERMOCOUPLE OPERATED DEVICES, TIMING DEVICES, DIFFERENTIAL PRESSURE AND TEMPERATURE DEVICES, VACUUM ACTUATED CONTROLLING AND INDICATING DEVICES, AND FLOAT ACTUATED CONTROLLING AND INDICATING DEVICES

Pressure, Vacuum, Thermostatic, and Temperature Circuit-Controlling Devices and Switches and Pressure-Controlling Switches and Mercury Tubes

MERCURY CONTACT DEVICES, TEMPERATURE DEVICES, [ TIMING DEVICES, ] DIFFERENTIAL PRESSURE DEVICES, PRESSURE ACTUATED MCHANICAL DEVICES, VACUUM CONTROLLING AND INDICATING DEVICES, AND FLOAT CONTROLLING AND INDICATING DEVICES*,VACUUM OPERATED ELECTRIC SWITCHES, PRESSURE OPERATED ELECTRIC SWITCHES, FLOAT OPERATED ELECTRIC SWITCHES, MECHANICALLY OPERATED ELECTRICSWITCHES, MERCURY SWITCHES, AND MAGNETICALLY OPERATED ELECTRIC SWITCHES*

Controlling Devices, Employing Electric Circuit Controlling Switches-Namely, Float Operated Electric Switches, Mechanically Operated Electric Switches, Magnetically Operated Electric Switches, and Parts Thereof Including Mercury Switches, and Light Actuated Flame Detectors

Limiting, Signalling, and Safety Devices-Namely, Temperature Actuated Flame Detectors, Barometrically Operated Devices, Thermocouple Operated Devices, Timing Devices, Differential Pressure and Temperature Devices, Vacuum Actuated Controlling and Indicating Devices