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Furnace
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Patent number 4,292,933
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Issue date Oct 6, 1981
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Hutterian Society of Brothers
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Daniel Meier
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F24 - HEATING RANGES VENTILATING
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Heat exchanger
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Patent number 4,203,392
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Issue date May 20, 1980
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Jack S. McLane
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F24 - HEATING RANGES VENTILATING
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3872855
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Patent number 3,872,855
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Issue date Mar 25, 1975
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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3589342
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Patent number 3,589,342
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Issue date Jun 29, 1971
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F22 - STEAM GENERATION