The first ever micro - automatic watch movement was patented by Uhrenfabrik Buren AG in the 50s . When their "Planetary Rotor" automatic movement was released in 1957 in the "super slender" line , it was one of the flattest automatics of its time and derivatives of the movement competed with the Universal Geneve micro-rotor for thinnest automatic in the world for years.
http://people.timezone.com/library/arch ... 4105468750
An Artifact Of Innovation-The Hamilton/Buren Intramatic
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