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Ribbon advance monitor
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Patent number 5,313,071
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Issue date May 17, 1994
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Unisys Corporation
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Thomas Dragon
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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Print drum with alignment marks
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Patent number 5,027,702
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Issue date Jul 2, 1991
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Unisys Corp.
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Thomas Dragon
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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Print hammer flight time control system
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Patent number 4,597,328
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Issue date Jul 1, 1986
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International Business Machines Corporation
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James E. Carrington
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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Dot printer
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Patent number 4,180,334
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Issue date Dec 25, 1979
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Oki Electric Industry Co., Ltd.
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Akinori Watanabe
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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3872788
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Patent number 3,872,788
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Issue date Mar 25, 1975
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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3469150
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Patent number 3,469,150
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Issue date Sep 23, 1969
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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3211087
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Patent number 3,211,087
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Issue date Oct 12, 1965
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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3183830
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Patent number 3,183,830
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Issue date May 18, 1965
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS