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Stamp with permeable hydrophylic matrix
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Patent number 8,453,569
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Issue date Jun 4, 2013
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International Business Machines Corporation
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Alexander Bietsch
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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Printing in a medium
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Patent number 8,336,456
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Issue date Dec 25, 2012
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International Business Machines Corporation
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Alexander Bietsch
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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Printing in a medium
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Patent number 7,891,295
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Issue date Feb 22, 2011
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International Business Machines Corporation
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Alexander Bietsch
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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Printing in a medium
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Patent number 7,434,512
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Issue date Oct 14, 2008
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International Business Machines Corporation
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Alexander Bietsch
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G01 - MEASURING TESTING
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2819668
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Patent number 2,819,668
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Issue date Jan 14, 1958
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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2049257
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Patent number 2,049,257
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Issue date Jul 28, 1936
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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1665197
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Patent number 1,665,197
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Issue date Apr 3, 1928
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS