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Rotary duplicating machine
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Patent number 3,995,546
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Issue date Dec 7, 1976
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Gerhard Ritzerfeld
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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3874284
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Patent number 3,874,284
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Issue date Apr 1, 1975
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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3613572
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Patent number 3,613,572
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Issue date Oct 19, 1971
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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2300575
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Patent number 2,300,575
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Issue date Nov 3, 1942
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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2068707
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Patent number 2,068,707
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Issue date Jan 26, 1937
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS