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
Bouquet holder, 19th century
Artificial concha, ca. 1830
Old Barrel Pattern aurolese phones, ca. 1845
Aurolese phones, 19th century
Hair receptor, 19th century
Sonotone Professional table set, Model 50, ca. 1949
Larm apparatus, 1908
Conversation tube, ca. 1860
Simplex Hearing Tube, ca. 1920
Rubber conversation tube, 19th century
Flexible conversation tube, 19th century
Tuning forks
