How come Warner cartoons did not have a sound system credit? All the other studios showed the RCA or Western Electric sound recording credit.
I don't know about others, but it wasn't AFAIK just those two..but yeah, I knpw.
For what it's worth, Vitaphone (familiar??) was theirs (credit: THe Animated Film Encyclopedia, 2000, Graham Webb, McFarland Press,N.C.)