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Full-face respirator lens
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Patent number D426298
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Issue date Jun 6, 2000
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3M Innovative Properties Company
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Vaughn B. Grannis
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D24 - Medical and laboratory equipment
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Full face respirator lens
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Patent number D409744
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Issue date May 11, 1999
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Minnesota Mining and Manufacturing Company
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Vaughn B. Grannis
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D24 - Medical and laboratory equipment
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Full face respirator lens
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Patent number D388872
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Issue date Jan 6, 1998
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Minnesota Mining and Manufacturing Company
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Vaughn B. Grannis
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D24 - Medical and laboratory equipment
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Buckle
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Patent number D379160
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Issue date May 13, 1997
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Minnesota Mining and Manufacturing Company
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Ronald C. Johansson
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D11 - Jewelry, symbolic insignia, and ornaments
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Full face respirator
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Patent number D378610
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Issue date Mar 25, 1997
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Minnesota Mining and Manufacturing Company
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Joseph G. Reischel
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D24 - Medical and laboratory equipment
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Unidirectional fluid valve
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Patent number 5,509,436
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Issue date Apr 23, 1996
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Minnesota Mining and Manufacturing Company
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Daniel A. Japuntich
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A62 - LIFE-SAVING FIRE-FIGHTING
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Unidirectional fluid valve
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Patent number 5,325,892
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Issue date Jul 5, 1994
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Minnesota Mining and Manufacturing Company
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Daniel A. Japuntich
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Heat exchanger
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Patent number 4,997,034
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Issue date Mar 5, 1991
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Minnesota Mining and Manufacturing Company
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James E. Steffen
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F28 - HEAT EXCHANGE IN GENERAL