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Automatic gas safety cut-offs of the thermocouple type
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Automatic safety control for gas burners
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Combination gas cock for thermostats
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Snap action valve mechanisms
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Valve structure
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Regulator
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Furnace-control apparatus
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Heat-regulating apparatus
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Thermostatic control apparatus
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Thermostat
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Water heater
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Water heater
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Automatic cut-off for gas-valves
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Gas safety burner
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