Electronic Hearing Aid (Vacuum Tube) Patent Print
Patent No. US1343717 · 1920
Invented by Earl C. Hanson
Vintage 1920 patent drawing of the electronic hearing aid (vacuum tube) by Earl C. Hanson. Museum-quality archival giclée print.
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About This Print
Vintage 1920 patent drawing of the electronic hearing aid (vacuum tube) by Earl C. Hanson. Museum-quality archival giclée print.
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