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Ticket taking system
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Patent number 4,086,475
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Issue date Apr 25, 1978
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William M. Churchill
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G06 - COMPUTING CALCULATING COUNTING
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3780844
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Patent number 3,780,844
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Issue date Dec 25, 1973
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G07 - CHECKING-DEVICES
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2238527
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Patent number 2,238,527
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Issue date Apr 15, 1941
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G07 - CHECKING-DEVICES
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1670522
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Patent number 1,670,522
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Issue date May 22, 1928
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G07 - CHECKING-DEVICES