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I believe some inventors like Jenkins who used the term radio vision versus television thought of television broadcast as a public device to be used in movie theaters vesus home entertainment. Jenkins envisioned up to date news broadcast between the movie reels. Sound in motion picture theaters just started in Oct 1927 and was still in its infancy in the early 1930s. Television broadcast over the air was only a couple days a week for a few hours each broadcast. Most people who bought a mechanical television receiver were people who already had shortwave receivers and radios so didn't need audio built in. I think since Western Television Corp was also pushing the video phone with mechanical TV technology in the 1930s that audio would seem natural to them? Their video phone system was demoed in public places like department stores and not meant for the home.
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