London dome hearing trumpet, 19th century
Precision Model 3AC21 table aid, ca. 1948
Booster-Duotone, 192-
Struycken monochord, 1910
Centerpiece receptor, ca. 1802
Bernafon Audioflex 300, 1997
Songbird Disposable Hearing Aid, 2000
Phonak Claro BTE and Remote Control, 2000
Phonak Watch Pilot Remote Control, 2000
Paravox Model J "Tiny-Myte", ca. 1949
Sonotone Model 940, ca. 1948
Binaural beard or neck receptor, 19th century
Dentaphone
Rhodes Audiphone, ca. 1879
Acousticon Model A-210, 1954.
Barrette type hearing device.
Acoustic walking stick, 19th century
London Dome hearing trumpet, ca. 1850
Phono-faradic apparatus, ca. 1897
Smith's Sound Receptor, ca. 1880