1930/en: Unterschied zwischen den Versionen
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Version vom 14. August 2011, 00:58 Uhr
| 1929 << 1930 >> 1931 |
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- On 11th January, 1930, Léon Hatot was awarded the main patent No. 704.910 for the Rolls-watch automatic winding mechanism. The additional patents Nos. 38.984, 39.523 and 39.581 were awarded to him on 30th November, 1931.