An early radio receiver using a crystal detector.
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"Crystal set" Quotes from Famous Books ![]() ![]() — The Blue Fairy Book • Various ![]() ![]() — The Doomsman • Van Tassel Sutphen ![]() ![]() — Wonderwings and other Fairy Stories • Edith Howes ![]() ![]() — The Adventure of Living • John St. Loe Strachey |
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