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Electronic timepiece
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Patent number 4,312,059
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Issue date Jan 19, 1982
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Kabushiki Kaisha Daini Seikosha
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Masaaki Mandai
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Electronic watch
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Patent number 4,276,626
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Issue date Jun 30, 1981
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Kabushiki Kaisha Daini Seikosha
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Katsuhiko Satoh
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G04 - HOROLOGY
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Electronic timepiece
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Patent number 4,217,751
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Issue date Aug 19, 1980
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Kabushiki Kaisha Daini Seikosha
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Akira Torisawa
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G04 - HOROLOGY
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Electronic timepiece
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Patent number 4,204,397
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Issue date May 27, 1980
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Kabushiki Kaisha Daini Seikosha
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Kazuhiro Asano
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G04 - HOROLOGY