— A "Ru--ian apparatus for restoring hearing consists of a light rubber shell, furimliecl with a miniature microphone, which is connected to a small galvanic battery. It is claimed that the microphone causes even the fcoftest speech to roact on the auditory nerve of the deaf when the apparatus it
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https://paperspast.natlib.govt.nz/newspapers/OW19020319.2.202.1
Bibliographic details
Otago Witness, Issue 2504, 19 March 1902, Page 74
Word Count
49Page 74 Advertisements Column 1 Otago Witness, Issue 2504, 19 March 1902, Page 74
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