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I have some early 1950s GE AM/FM radios where the volume control and band selector knobs are captive. The Tuning knob is insulated from the metal chassis. The screws on the bottom are also insulated from the chassis and the back contains an interlock, so power is off when it is removed. This is one safe radio!!!.
I also have some AC/DC radios from the 1940s where the metal chassis, possibly at 120 VAC, is easily accesable by removing a knob or picking the radio up and touching a hold down screw. What a difference a decade made.
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