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Adjustable grid drawing frame
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Patent number 9,440,482
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Issue date Sep 13, 2016
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David Cunningham
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Viewfinder for artists
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Patent number 7,401,410
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Issue date Jul 22, 2008
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Russell P. Jewell
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Artwork analysis device
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Patent number 5,016,357
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Issue date May 21, 1991
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Paulina K. Leonard
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Matting device
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Patent number 4,461,086
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Issue date Jul 24, 1984
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Diana E. Segletes
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3851394
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Patent number 3,851,394
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Issue date Dec 3, 1974
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3479741
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Patent number 3,479,741
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Issue date Nov 25, 1969
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3358916
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Patent number 3,358,916
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Issue date Dec 19, 1967
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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2487690
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Patent number 2,487,690
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Issue date Nov 8, 1949
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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1964197
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Patent number 1,964,197
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Issue date Jun 26, 1934
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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1618164
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Patent number 1,618,164
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Issue date Feb 22, 1927
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES