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Ball-point pen cap
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Patent number 5,915,871
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Issue date Jun 29, 1999
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Mitsubishi Pencil Kabushiki Kaisha
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Seiichi Kobayashi
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Ball-point pen with back flow stop
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Patent number 5,711,626
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Issue date Jan 27, 1998
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Mitsubishi Pencil Kabushiki Kaisha
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Seiichi Kobayashi
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Metal tip for ball-point pen
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Patent number 5,690,442
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Issue date Nov 25, 1997
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Mitsubishi Pencil Kabushiki Kaisha
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Shinsuke Sato
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Ball-point pen
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Patent number 5,678,942
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Issue date Oct 21, 1997
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Mitsubishi Pencil Kabushiki Kaisha
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Seiichi Kobayashi
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES