And 1921 between RCA, Westinghouse and AT&T meant that Armstrong could freely use the Lévy patent
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And 1921 between RCA, Westinghouse and AT&T meant that Armstrong could freely use the Lévy patent
Text from Wikipedia, available under CC BY-SA 4.0.
Captured 2026-08-18 from Wikipedia. The archived copy is preserved so this citation survives link rot.