Deafness in Disguise: Concealed Hearing Devices of the 19th and 20th CenturiesExhibit, gallery and explanations of 19th century hearing aids#US History#US History II#culture#US History I·beckerexhibits.wustl.edu·Mar 21, 2007Deafness in Disguise: Concealed Hearing Devices of the 19th and 20th Centuries