There are pages and pages (LONG pages!) of the history of the audio, visual, studio battles with GE, Western Electric, etc here.
www.graumanschinese.org/projection-1.html#golden
Grauman's Chinese theater tech history
Grauman's Chinese theater tech history
2 DR250s, 2 27" Lab15 T-60s, 2 30" Neo Titan 39s, 1 Autotuba...and looking for more!
Re: Grauman's Chinese theater tech history
Some fascinating stuff in there. Thanks for the read, Rich. 
- Bill Fitzmaurice
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Re: Grauman's Chinese theater tech history
Interesting. I noticed some technical inaccuracies, but it's still a good read. This is pretty good as well: https://www.audioheritage.org/