1954 - Micro-rotor for automatic movements

Buren Comapny patented a "micro rotor" in1954. This allowed Buren to produce an even flatter watch with automatic winding. Reducing the diameter of the rotor and locating it in the same plane as the other parts of the movement, Buren avoided having to place the rotor at the back of the movement - as it has been used until now.

The first Buren microrotor watches were called "Super Slenders" and used the movements of the 1000 and 1001 series. Later they were also known as "INTRAmatic".

Buren also licensed its technology to other companies, including IWC, Baume & Mercier, Bulova and Hamilton. After a patent dispute, Buren also licensed micro rotor technology for Universal Geneve.
 

Universal Geneve filed a patent application in 1955 for the use of a microrotor in the UG 215 movement.
 

Application: Władysław Meller

Other records: Timeline of Watchmaking Innovations