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3618332
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Patent number 3,618,332
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Issue date Nov 9, 1971
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F17 - STORING OF DISTRIBUTING GASES OR LIQUIDS
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3397547
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Patent number 3,397,547
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Issue date Aug 20, 1968
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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3233419
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Patent number 3,233,419
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Issue date Feb 8, 1966
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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3080724
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Patent number 3,080,724
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Issue date Mar 12, 1963
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...