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"The Nobel-prize-winning physicist Richard Feynman wrote about his early childhood experience repairing transistor radios in the 1930s."

They would not be transistor radios in the 1930s. Battery radios had valves/tubes in them and two kinds of battery. The picture is a very late 1950s/early 60s transistor radio.

Nice site, interesting content, have you ever come across the British judge Lord Denning? He was a mathematician to begin with then turned to law having decided that teaching was boring.

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