[ProAudio] Western Electric 111C transformers

[Jim Brown]

On 2/1/2022 1:05 PM, Bob Olhsson via ProAudio wrote:
> The phone company held patents on electrical recording, motion picture sound and broadcasting until the late 1940s.

AT&T Bell Labs might have been the premier engineering entity on the 
planet for most of the 20th century. Their periodical, Bell System 
Technical Journal, documented many (most?) of the major electrical 
engineering inventions and research during the first half of that 
century, especially in audio and communications. RCA also had a serious 
engineering department. David is one of two people I know who own large 
collections of the BSTJ.

Jim Brown