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An interesting side note. I’m foggy on this, but in Milwaukee in the 1960’s, (it could have been in the 50’s) radio and television stations cooperated on broadcasting stereo on two different frequencies. You had to have two FM receivers, one for the the right and the other for the left channel.
The same was true for television prior to multiplex. The TV station broadcast a special with one audio channel and an FM station broadcast the other channel.
I remember doing this and it worked well enough for the time.
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