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Hey
Late to the thread!
Alls I know is that the RCA chassis CTC-97 has a 2 or 3 button ultrasonic remote. Mine's from 1980. It has been in storage for a few years, after I replaced the delay line and did some other basic chassis work to it. It was a thrift find and made a great pic after some surgery to the circuitry. I had some great screenshots of it, but they are not accessible due to the server crash, and the fact that I delete the 'masters'.
I have never seen any brand tv with an ultrasonic remote control, past 1980.
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