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pre 1965 transistor radios
My father bought one for me about 1960 it was a 2 transistor thing, and would pick up the local (10 miles away) 50,000 watt stations if you stood in exactly the right spot facing the exact right direction. They weren't very good but they were portable and didnt need 10 lbs of batteries like the portable tube versions of the day.
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Have worked for about 40 years testing, marketing and manufacturing almost all types of electrical insulation materials. Epoxys, nomex, magnet wire enamels, mica tapes, almost any type of dielectric material out there.
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