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Binaural phonendoscope

Conversation tube hearing aid

1870-1930

"Fortiphone" battery hearing aid, cased, by Siemens and Halske, Berlin, 1900-1940

"Fortiphone" battery hearing aid

1900-1940

"Fortiphone 30A" electrical hearing aid, cased, by Fortiphone, London, 1945-1960

"Fortiphone 30A" electrical hearing aid

1945-1960

"Duchess" electrical hearing aid, cased, English, 1950-1970

"Duchess" electrical hearing aid

1950-1970

Medresco battery hearing aid with leather case, English, 1950-1965

Medresco battery hearing aid with leather case