Struycken monochord, 1910
Booster-Duotone, 192-
Precision Model 3AC21 table aid, ca. 1948
London dome hearing trumpet, 19th century
London dome hearing trumpet, 19th century
"Staniland" model canteen receptor.
Acousticon Model 56, ca. 1928
Phonac Model C, ca. 1928
Conversation tube, 1796 or 1805.
Woman wearing decorative earring, for Sonotone advertisement, circa 1950.
Man modeling a hearing device in a vest pocket, for Sonotone advertisement, circa 1950.
Beltone eyeglass aid photo, 1960
Hal-Hen advertising photo, ca. 1952
S. Richard Silverman and Agnes Moorehead, circa 1950s.
Photograph of framed note from L.V. Rein, no date.
CID teacher with student, 1930s
Photo of Rein Aurolese Phones advertisement, circa 1900.
Woman modeling hearing device and battery harness attached to undergarments, circa 1950.
Man modeling hearing device and battery harness attached to undergarments, for Sonotone advertisement, circa 1950.
Four men seated at a table in the CID library demonstrating the Desk-top hearing instrument, circa 1926.