Thermostatically self-regulating mixing valve
Three button approach for remote control air conditioner delayed
Three port thermal vacuum valve with electrical switch
Three-port thermally responsive valve
Three-way temperature regulator valve containing separate valve
Time controlled thermostat
Time variable thermostat
Time variable thermostat
Time variable thermostat
Time-controlled heat regulator with nighttime temperature loweri
Timed rate pneumatic control
Timer controlled space thermostat with battery operated timer
Timing device for thermostatic-control units
Tri-state electrical circuit
Trip-free high limit control
Two stage furnace control
Two stage thermostatic valve device
Two terminal line voltage thermostat
Two way fluid switchover valve with crossover protection
Two wire line voltage thermostat