Abstract
I HAVE received a number of letters on this subject which I cannot reply to singly. So far as my own experience goes any audiphone is a total failure in about two-thirds of the cases of deafness.
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FLETCHER, T. The Audiphone. Nature 21, 515 (1880). https://doi.org/10.1038/021515d0
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DOI: https://doi.org/10.1038/021515d0
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