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Portable electronic device
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Patent number 4,250,571
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Issue date Feb 10, 1981
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Citizen Watch Company Limited
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Heihachiro Ebihara
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G04 - HOROLOGY
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Electronic watch
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Patent number 4,155,218
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Issue date May 22, 1979
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Ebauches S.A.
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Fridolin Wiget
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G04 - HOROLOGY
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Electronic digital watch
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Patent number 4,128,991
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Issue date Dec 12, 1978
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Ebauches S.A.
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Jean-Claude Robert-Grandpierre
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G04 - HOROLOGY
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Electronic timepiece
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Patent number 4,107,915
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Issue date Aug 22, 1978
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Citizen Watch Co., Ltd
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Fukuo Sekiya
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G04 - HOROLOGY
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Electronic timepiece
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Patent number 4,067,187
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Issue date Jan 10, 1978
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Citizen Watch Co., Ltd.
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Fukuo Sekiya
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G04 - HOROLOGY
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-
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3889460
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Patent number 3,889,460
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Issue date Jun 17, 1975
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G04 - HOROLOGY