Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB12040/54A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by IndividualfiledCriticalIndividual
Publication of GB762400ApublicationCriticalpatent/GB762400A/en
762,400. Hearing aids. SCHUMANN, E. April 26, 1954 [April 27, 1953], No. 12040/54. Drawings to Specification. Class 40 (4). The microphone and the receiver of a hearing aid are mounted on opposite side pieces of a spectacle frame to avoid acoustic reaction. Sound is transmitted, from the receiver to an earplug through a chamber of adjustable capacity and a plastic tube.
GB12040/54A1953-04-271954-04-26Improvements in and relating to electroacoustic hearing aids
ExpiredGB762400A
(en)
Improvements in electro-acoustic transducer which is incorporated in a capsule and comprises a transistor amplifier particularly for telephone handsets