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Ink container
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Patent number 7,168,797
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Issue date Jan 30, 2007
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Riso Kagaku Corporation
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Masakatsu Arai
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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Ink container
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Patent number D524366
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Issue date Jul 4, 2006
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Riso Kagaku Corporation
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Masakatsu Arai
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D18 - Printing and office machinery
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Stencil making device
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Patent number 6,220,155
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Issue date Apr 24, 2001
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Riso Kagaku Corporation
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Kaoru Kimura
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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Stencil forming apparatus
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Patent number 5,893,324
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Issue date Apr 13, 1999
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Riso Kagaku Corporation
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Kaoru Kimura
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS