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Printing mechanism
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Patent number 4,403,546
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Issue date Sep 13, 1983
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General Signal Corporation
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Lyell G. Sanford
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G07 - CHECKING-DEVICES
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3780378
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Patent number 3,780,378
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Issue date Dec 18, 1973
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G07 - CHECKING-DEVICES
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3401374
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Patent number 3,401,374
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Issue date Sep 10, 1968
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G07 - CHECKING-DEVICES
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2433118
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Patent number 2,433,118
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Issue date Dec 23, 1947
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G07 - CHECKING-DEVICES