US1949210A
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Two-level temperature thermostat
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US1931663A
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Regulator
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US1919337A
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Thermostatic controller
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US1848087A
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Regulator
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US1792101A
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Thermostatic control for heating systems
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US1688121A
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Safety device for hot-air furnaces
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US1593581A
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Hot-air-furnace regulator
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US1650993A
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Regulator for heating systems
|
US1685286A
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Fluid-pressure-control valve
|
US1543418A
|
|
Regulator for high-pressure systems
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US1543445A
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Regulator for high-pressure systems
|
US1387853A
|
|
Boiler and damper regulator for both steam and hot water
|
US1376948A
|
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High-pressure standard regulator
|
CA144575A
|
|
Expansion valve
|
US1146803A
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Regulator for expansion-valves.
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CA141668A
|
|
Expansion valve
|
US1185689A
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|
Expansion-valve.
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US1044197A
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Valve-operating mechanism for motors.
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US1153234A
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Humidity-controlling apparatus.
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US1058874A
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Temperature-regulating apparatus.
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