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Spiral art device
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Patent number 10,864,766
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Issue date Dec 15, 2020
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Crayola, LLC
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John D. McBride
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Line marking device
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Patent number 5,699,622
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Issue date Dec 23, 1997
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Gerald G. Umbro
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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-
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Jig for cross hatching test
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Patent number 5,056,228
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Issue date Oct 15, 1991
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Taiyu Kizai Co., Ltd.
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Norihiko Yamamoto
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Measuring tool
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Patent number 4,513,510
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Issue date Apr 30, 1985
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Ronald C. Swanson
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Precision drafting instrument
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Patent number 4,222,693
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Issue date Sep 16, 1980
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The United States of America as represented by the Secretary of the Interior
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Eugene E. Zang
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3886662
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Patent number 3,886,662
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Issue date Jun 3, 1975
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3846914
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Patent number 3,846,914
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Issue date Nov 12, 1974
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3805395
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Patent number 3,805,395
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Issue date Apr 23, 1974
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3639991
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Patent number 3,639,991
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Issue date Feb 8, 1972
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3618137
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Patent number 3,618,137
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Issue date Nov 2, 1971
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3581401
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Patent number 3,581,401
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Issue date Jun 1, 1971
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3515065
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Patent number 3,515,065
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Issue date Jun 2, 1970
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3475822
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Patent number 3,475,822
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Issue date Nov 4, 1969
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3473228
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Patent number 3,473,228
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Issue date Oct 21, 1969
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3293758
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Patent number 3,293,758
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Issue date Dec 27, 1966
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3235969
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Patent number 3,235,969
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Issue date Feb 22, 1966
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3153858
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Patent number 3,153,858
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Issue date Oct 27, 1964
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3077668
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Patent number 3,077,668
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Issue date Feb 19, 1963
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES