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Time recorder
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Patent number 3,978,493
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Issue date Aug 31, 1976
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Simplex Time Recorder Company
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Gunther Trischler
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G07 - CHECKING-DEVICES
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Time recorder
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Patent number 3,952,313
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Issue date Apr 20, 1976
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Simplex Time Recorder Co.
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Erich Willmann
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G07 - CHECKING-DEVICES
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3681774
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Patent number 3,681,774
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Issue date Aug 1, 1972
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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3312977
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Patent number 3,312,977
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Issue date Apr 4, 1967
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G01 - MEASURING TESTING
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2724631
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Patent number 2,724,631
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Issue date Nov 22, 1955
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G01 - MEASURING TESTING
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2665187
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Patent number 2,665,187
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Issue date Jan 5, 1954
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G01 - MEASURING TESTING
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2516217
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Patent number 2,516,217
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Issue date Jul 25, 1950
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G01 - MEASURING TESTING
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2392916
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Patent number 2,392,916
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Issue date Jan 15, 1946
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G01 - MEASURING TESTING
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2207343
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Patent number 2,207,343
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Issue date Jul 9, 1940
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G01 - MEASURING TESTING
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2207344
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Patent number 2,207,344
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Issue date Jul 9, 1940
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G01 - MEASURING TESTING
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2125345
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Patent number 2,125,345
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Issue date Aug 2, 1938
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G01 - MEASURING TESTING
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1856528
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Patent number 1,856,528
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Issue date May 3, 1932
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G01 - MEASURING TESTING
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1564519
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Patent number 1,564,519
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Issue date Dec 8, 1925
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G01 - MEASURING TESTING
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1564558
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Patent number 1,564,558
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Issue date Dec 8, 1925
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G01 - MEASURING TESTING