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Indicating devices
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Patent number 4,240,146
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Issue date Dec 16, 1980
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Plessey Handel und Investments AG
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Christopher W. Iles
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G06 - COMPUTING CALCULATING COUNTING
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Taximeter indicating devices
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Patent number 4,167,040
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Issue date Sep 4, 1979
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Plessey Handel und Investments AG
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Francis R. Heritier
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G06 - COMPUTING CALCULATING COUNTING
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3873811
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Patent number 3,873,811
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Issue date Mar 25, 1975
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G07 - CHECKING-DEVICES
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3698627
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Patent number 3,698,627
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Issue date Oct 17, 1972
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G07 - CHECKING-DEVICES
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3388859
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Patent number 3,388,859
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Issue date Jun 18, 1968
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G06 - COMPUTING CALCULATING COUNTING