United States Patent 3166894
US Patent References:
Thermally responsive actuator
2990716
Actuator for thermally responsive control devices
2548941
Cylinder and piston assembly for hydraulic apparatus
2468511
Thermally responsive actuator
2990716
Actuator for thermally responsive control devices
2548941
Cylinder and piston assembly for hydraulic apparatus
2468511
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337/315
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