1930/en
Version vom 13. August 2011, 23:55 Uhr von Torsten (Diskussion | Beiträge)
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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.