|1930 << 1931 >> 1932|
- 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.
- Siegfried Möckel was born on 28th March, 1931.
- Gérald Charles Genta was born on 1st May, 1931 in Geneva.
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