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Laboratory glassware equipment
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Patent number 4,803,053
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Issue date Feb 7, 1989
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Kenneth L. Williamson
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Relaxing joints
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Patent number 4,171,832
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Issue date Oct 23, 1979
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International Harvester Company
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Arthur G. Metcalfe
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F28 - HEAT EXCHANGE IN GENERAL
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3499670
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Patent number 3,499,670
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Issue date Mar 10, 1970
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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3425716
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Patent number 3,425,716
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Issue date Feb 4, 1969
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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2240078
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Patent number 2,240,078
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Issue date Apr 29, 1941
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...