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Writing implement
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Patent number 6,659,672
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Issue date Dec 9, 2003
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Mitsubishi Pencil Kabushiki Kaisha
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Kazuhisa Kirita
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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-
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Composite pen tip
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Patent number 4,410,290
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Issue date Oct 18, 1983
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Pilot Ink Co., Ltd.
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Akio Ito
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Tubular writing pen
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Patent number 3,977,798
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Issue date Aug 31, 1976
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Koh-I-Noor Rapidograph, Inc.
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Lasse Kuparinen
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3859190
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Patent number 3,859,190
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Issue date Jan 7, 1975
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3836266
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Patent number 3,836,266
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Issue date Sep 17, 1974
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3388455
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Patent number 3,388,455
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Issue date Jun 18, 1968
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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2214494
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Patent number 2,214,494
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Issue date Sep 10, 1940
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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2197628
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Patent number 2,197,628
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Issue date Apr 16, 1940
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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2153032
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Patent number 2,153,032
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Issue date Apr 4, 1939
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES