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Electrolytic printing head
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Patent number 4,539,576
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Issue date Sep 3, 1985
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International Business Machines Corporation
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Dudley A. Chance
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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3702001
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Patent number 3,702,001
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Issue date Oct 31, 1972
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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3427633
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Patent number 3,427,633
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Issue date Feb 11, 1969
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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3075193
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Patent number 3,075,193
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Issue date Jan 22, 1963
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS