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A German signals NCO pulls a radio from a knocked-out Canadian Sherman near Caen. He opens it expecting to find a frequency advantage or a power trick — something he can report and counter. Instead, he finds two vacuum tubes from two different Canadian factories that fit the same socket perfectly. No adjustment. No hand-fitting. Identical.
In July 1944, German intercept teams in Normandy logged something they couldn't explain — a single Canadian voice transmitting six digits, followed by seventy-two guns firing on that exact coordinate within minutes. Their own system needed a chain of command and ten minutes to do what the Canadians did in ninety seconds. The answer wasn't a secret weapon. It was sitting on a table in a farmhouse cellar, inside eighty-six pounds of Canadian-built metal, glass, and wire.
What that radio revealed — layer by layer, component by component — told the German officer more about why Germany was losing this war than four years of signals work ever had. And the deepest layer had nothing to do with electronics.
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