As the father of bumper automatic watches in a wristwatch. He granted his patent by UK around 1923 in his pocket watch prototype then proceed to ask fortis to make it manufactured en masse in the 1926 and introduced it in the baselworld 1926.
The Léon Hatot Rolls is interesting indeed, he's working with Blancpain to work with his watch which the whole movement moving up and down inside the case (thus that long slit in the case for the crown) back in 1930 though not en masse. Rolex invent and produced their own automatic oyster back in 1931 claiming to be the first automatic watch that could produced for the masses, while this spark the problem with the inventor of masses automatic watch, rolex apologize to Harwood in 1956 then proceed with putting his portrait together with Perellet (father of automatic in a mechanical watch) in their future ad/poster.