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Patent number 10,589,562
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Issue date Mar 17, 2020
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Wacom Co., Ltd.
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Takenori Kaneda
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Multi-color pen system
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Issue date Jul 30, 2002
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Chartpak, Inc.
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Bruce W. Brunetti
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Dual refill-type writing utensil
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Issue date Oct 15, 1991
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Kotobuki & Co., Ltd.
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Writing tools
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Issue date Dec 11, 1990
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Kotobuki & Co., Ltd.
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Shuhei Kageyama
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Combined writing tool
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Issue date Nov 6, 1990
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Shuhei Kageyama
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