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Desk-top hearing instrument, circa 1875.
Desk-top hearing instrument, circa 1875.
Hal-Hen Pearl Hearing Aid Cord Necklace model, 1947.
Hal-Hen Pearl Hearing Aid Cord Necklace model, 1947.
Graph of functional gain analysis of the London Dome hearing device, circa 1984.
Graph of functional gain analysis of the London Dome hearing device, circa 1984.
Woman modeling hearing device and battery harness attached to undergarments, for Sonotone adverti...
Woman modeling hearing device and battery harness attached to undergarments, for Sonotone advertisement, circa 1950.
Young boy modeling hearing device and battery harness attached to undergarments, for Sonotone adv...
Young boy modeling hearing device and battery harness attached to undergarments, for Sonotone advertisement, circa 1950.
Rhodes Audiophone patent, circa 1879.
Rhodes Audiophone patent, circa 1879.
Western Electric 1-A Audiometer, circa 1920s.
Western Electric 1-A Audiometer, circa 1920s.
Man modeling the acoustic walking stick, circa 1920s.
Man modeling the acoustic walking stick, circa 1920s.
Western Electric 1-A Audiometer in use, circa 1920s.
Western Electric 1-A Audiometer in use, circa 1920s.
Woman demonstrating the Rhodes Audiophone while holding the Folding Dentaphone, front view, circa...
Woman demonstrating the Rhodes Audiophone while holding the Folding Dentaphone, front view, circa 1926.
Woman demonstrating the Rhodes Audiophone while holding the Folding Dentaphone, side view, circa ...
Woman demonstrating the Rhodes Audiophone while holding the Folding Dentaphone, side view, circa 1926.
Four men seated at a table in the CID library demonstrating the Desk-top hearing instrument, circ...
Four men seated at a table in the CID library demonstrating the Desk-top hearing instrument, circa 1926.
Man modeling hearing device and battery harness attached to undergarments, for Sonotone advertise...
Man modeling hearing device and battery harness attached to undergarments, for Sonotone advertisement, circa 1950.
Woman modeling hearing device and battery harness attached to undergarments, circa 1950.
Woman modeling hearing device and battery harness attached to undergarments, circa 1950.
Photo of Rein Aurolese Phones advertisement, circa 1900.
Photo of Rein Aurolese Phones advertisement, circa 1900.
CID teacher with student, 1930s
CID teacher with student, 1930s
Photograph of framed note from L.V. Rein, no date.
Photograph of framed note from L.V. Rein, no date.
S. Richard Silverman and Agnes Moorehead, circa 1950s.
S. Richard Silverman and Agnes Moorehead, circa 1950s.
Hal-Hen advertising photo, ca. 1952
Hal-Hen advertising photo, ca. 1952
Beltone eyeglass aid photo, 1960
Beltone eyeglass aid photo, 1960
Results 21 to 40 of 26121