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Programmable time recorder
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Patent number 6,061,303
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Issue date May 9, 2000
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Simplex Time Recorder Company
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Walter P. Gauthier
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G07 - CHECKING-DEVICES
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Programmable time recorder
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Patent number 5,793,707
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Issue date Aug 11, 1998
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Simplex Time Recorder Company
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Walter P. Gauthier
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G07 - CHECKING-DEVICES
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Data terminal system
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Patent number 4,639,583
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Issue date Jan 27, 1987
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Jeffrey H. Zerowin
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G06 - COMPUTING CALCULATING COUNTING
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Time card and carrier
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Patent number 4,542,286
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Issue date Sep 17, 1985
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Simplex Time Recorder Co.
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Jeffrey Golarz
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G06 - COMPUTING CALCULATING COUNTING
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3596286
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Patent number 3,596,286
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Issue date Jul 27, 1971
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G07 - CHECKING-DEVICES
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3405867
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Patent number 3,405,867
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Issue date Oct 15, 1968
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G07 - CHECKING-DEVICES
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3054987
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Patent number 3,054,987
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Issue date Sep 18, 1962
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G07 - CHECKING-DEVICES