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Produce cooler
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Patent number 4,123,917
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Issue date Nov 7, 1978
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NPI Corporation
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Richard E. Curtis
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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Air handler
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Patent number 4,044,078
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Issue date Aug 23, 1977
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NPI Corporation
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Richard E. Curtis
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F28 - HEAT EXCHANGE IN GENERAL
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Produce warmer
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Patent number 4,042,017
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Issue date Aug 16, 1977
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Mobile Product Services, Inc.
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Robert H. Dench
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A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES