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Fail-safe thermostatic valve
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Patent number 4,453,668
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Issue date Jun 12, 1984
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Caltherm Corporation
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Martin L. Abel
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G05 - CONTROLLING REGULATING
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3776457
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Patent number 3,776,457
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Issue date Dec 4, 1973
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G05 - CONTROLLING REGULATING
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3420217
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Patent number 3,420,217
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Issue date Jan 7, 1969
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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2323533
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Patent number 2,323,533
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Issue date Jul 6, 1943
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G05 - CONTROLLING REGULATING
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2293913
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Patent number 2,293,913
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Issue date Aug 25, 1942
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES