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3550917
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Patent number 3,550,917
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Issue date Dec 29, 1970
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2883169
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Patent number 2,883,169
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Issue date Apr 21, 1959
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2588591
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Patent number 2,588,591
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Issue date Mar 11, 1952
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A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
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2521334
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Patent number 2,521,334
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Issue date Sep 5, 1950
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D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...