A little off topic, but since you brought it up...both Vitaphone and Movietone were connected with AT & T, whose Western Electric Company effectively monopolized movie sound. When RCA developed (with GE) what they considered an improved sound system, called RCA Photophone, they pretty much had to start their own film and theatre company in order to break into the market. Joe Kennedy had finished his fling with movie making (and his fling with Gloria Swanson) and had a third-rate movie studio (called FBO) and a chain of vaudeville houses he wanted to unload. David Sarnoff and company bought them, and turned them into RKO (Radio-Keith-Orpheum,) equipping everything with RCA sound systems. (So not for no reason were they called "Radio Pictures!") Kennedy held on to the Pathe' film studio for a couple years longer, then sold it to RCA as well in what would now be an illegal "pump-and-dump" stock scam that lined his own pockets while fleecing other stockholders.