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Timepiece movement
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Patent number 4,912,690
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Issue date Mar 27, 1990
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Rhythm Watch Co., Ltd.
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Norihiko Nakamura
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G04 - HOROLOGY
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2253763
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Patent number 2,253,763
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Issue date Aug 26, 1941
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G04 - HOROLOGY
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2189334
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Patent number 2,189,334
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Issue date Feb 6, 1940
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G04 - HOROLOGY
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1708610
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Patent number 1,708,610
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Issue date Apr 9, 1929
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G04 - HOROLOGY
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76108
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Patent number 76,108
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Issue date Mar 31, 1868
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G04 - HOROLOGY