alb3154130
Inventor Earl C. Hanson
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Title:
Inventor Earl C. Hanson
Caption:
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.
Credit:
Album / Universal Images Group / Underwood Archives/UIG
Releases:
Model: No - Property: No
Rights questions?
Rights questions?
Image size:
4800 x 3853 px | 52.9 MB
Print size:
40.6 x 32.6 cm | 16.0 x 12.8 in (300 dpi)
Keywords:
1910S • 1920 S • 1920S • 1926 • B & W • B / W • B&W • BLACK & WHITE • BLACK AND WHITE • COMMUNICATIONS • E-COMMERCE • EE. UU. • EEUU • ELECTRONIC COMMERCE • ELECTRONIC SYSTEM • ELECTRONICS • ESTADOS UNIDOS USA EEUU EE. UU. EUA E. U. A. • HEADSETS • HEARING AIDS • HISTORIC • HISTORICAL • HORIZONTAL • HUMANS • INDOORS • INVENTIONS • INVENTORS • NORTH AMERICA • NORTH AMERICAN • ONE MALE ONLY • ONE MAN ONLY • PEOPLE • PHOTO • PHOTOGRAPH • PHOTOGRAPHY • RADIO EQUIPMENT • TECHNOLOGY • TWENTIES, THE • U. S. A • U. S. A. • U.S. • UNITED STATES OF AMERICA • UNITED STATES • UNITED STATES, THE • UNITES STATES OF AMERICA USA • USA • VACUUM TUBES • VINTAGE
