Hearing Aid Patent Print
This Patent for a Wearable Bone-conduction Hearing Aid was invented by Hugo Lieber and filed on March 22, 1939. It was issued on July 15, 1941 by the United States Patent and Trademark Office.
Please Choose your Options for your Patent Print:
Discounts: Buy more - save more
Buy 3 or more items, get 5% off
Buy 5 or more items, get 8% off
Buy 7 or more items, get 10% off
Buy 10 or more items, get 15% off