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Pneumatically erasable slate
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Patent number 9,744,799
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Issue date Aug 29, 2017
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LIG SCIENCES, INC
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Sang Beom Lee
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Luminescent display device
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Patent number 5,368,489
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Issue date Nov 29, 1994
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Procorp. Inc.
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Peter A. Confalone
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Pneumatically cleared toy slate
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Patent number 3,943,643
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Issue date Mar 16, 1976
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Scott-Fisher Development Company
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John B. Fisher
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3838520
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Patent number 3,838,520
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Issue date Oct 1, 1974
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3760505
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Patent number 3,760,505
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Issue date Sep 25, 1973
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3579871
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Patent number 3,579,871
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Issue date May 25, 1971
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B42 - BOOKBINDING ALBUMS FILES SPECIAL PRINTED MATTER
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3497970
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Patent number 3,497,970
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Issue date Mar 3, 1970
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3484952
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Patent number 3,484,952
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Issue date Dec 23, 1969
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3152406
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Patent number 3,152,406
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Issue date Oct 13, 1964
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3149426
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Patent number 3,149,426
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Issue date Sep 22, 1964
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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2917838
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Patent number 2,917,838
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Issue date Dec 22, 1959
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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2894336
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Patent number 2,894,336
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Issue date Jul 14, 1959
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B42 - BOOKBINDING ALBUMS FILES SPECIAL PRINTED MATTER
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2789373
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Patent number 2,789,373
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Issue date Apr 23, 1957
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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2697884
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Patent number 2,697,884
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Issue date Dec 28, 1954
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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2669791
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Patent number 2,669,791
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Issue date Feb 23, 1954
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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2663095
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Patent number 2,663,095
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Issue date Dec 22, 1953
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES