United States: c. 1926 Inventor Earl C. Hanson holding the the peanut vacuum tube that he used in patenting the first vacuum tube hearing aid called the Vactuphone.
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Image Number: 1035-12809Rights ManagedCredit Line:SuperStock / Underwood Photo ArchivesCollection: Underwood Photo Archives Model Release:NoProperty Release:NoResolution:4800×3853
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