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3349571
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Patent number 3,349,571
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Issue date Oct 31, 1967
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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2632316
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Patent number 2,632,316
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Issue date Mar 24, 1953
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...