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Liquid level control system
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Patent number 4,336,825
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Issue date Jun 29, 1982
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Factory Mutual Research Corporation
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Russell F. Pion
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G05 - CONTROLLING REGULATING
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2441123
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Patent number 2,441,123
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Issue date May 4, 1948
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F22 - STEAM GENERATION
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1653324
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Patent number 1,653,324
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Issue date Dec 20, 1927
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F22 - STEAM GENERATION
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1597942
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Patent number 1,597,942
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Issue date Aug 31, 1926
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F22 - STEAM GENERATION