|1929 << 1930 >> 1931|
- 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.
- Emile Walker died on 17th April, 1930 in Saint-Imier.
- Frédéric-Auguste Marti died on 14th August, 1930 in Vieux-Charmont.
- Gustav Rohde died on 1st September, 1930.
- Gustav Hesse died on 28th October, 1930.
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