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Multiple coil heat exchanger
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Patent number 4,495,989
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Issue date Jan 29, 1985
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Spiral Tubing Corporation
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Richard W. Sievers
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3007680
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Patent number 3,007,680
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Issue date Nov 7, 1961
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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1697600
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Patent number 1,697,600
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Issue date Jan 1, 1929
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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1639172
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Patent number 1,639,172
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Issue date Aug 16, 1927
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F28 - HEAT EXCHANGE IN GENERAL
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705614
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Patent number 705,614
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Issue date Jul 29, 1902
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F28 - HEAT EXCHANGE IN GENERAL
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84996
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Patent number 84,996
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Issue date Dec 15, 1868
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F28 - HEAT EXCHANGE IN GENERAL