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Easily removable instrument pen tip
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Patent number 4,316,197
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Issue date Feb 16, 1982
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Graphic Controls Corporation
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James R. Hubbard
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Disposable marker
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Patent number 4,100,549
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Issue date Jul 11, 1978
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Graphic Controls Corporation
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James R. Hubbard
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Marker with three phase ink circuit
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Patent number 4,017,871
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Issue date Apr 12, 1977
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Graphic Controls Corporation
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James R. Hubbard
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Truncated ball pen
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Patent number 4,017,870
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Issue date Apr 12, 1977
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Graphic Controls Corporation
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James R. Hubbard
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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