Final answer:
Warner Brothers' sync sound system that used a 17" lacquer record was called Vitaphone, a significant innovation in the development of 'talkies' during the 1920s.
Step-by-step explanation:
The Warner Brothers sync sound system that used a 17" lacquer record was called Vitaphone. Vitaphone was a pioneering sound-on-disc system which notably enabled Warner Bros.
to produce and release films with a soundtrack that was synchronized with the motion picture. This technology emerged in the 1920s and was instrumental in the development of the talkies, movies with synchronized dialogue.
The Vitaphone system involved recording sound onto a record that would be played in sync with the film reel during playback, providing audiences with a more immersive cinematic experience that combined moving images with sound.