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Brownie crystal radio receiver and a pair of BTH headphones, mid 1920s. by Richardson, Claire at Science and Society Picture Library
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Brownie crystal radio receiver and pair of Lisen headphones, mid 1920s. by Whicher, Adrian at Science and Society Picture Library
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Crystal earpiece - Wikipedia
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Brownie crystal radio receiver and pair of BTH headphones, mid 1920s. by Fernandes, Iris at Science and Society Picture Library
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Crystal radio receiver | Science Museum Group Collection
