PATHOGENESIS OF DEAFNESS DUE TO CHRONIC NON-SUPPURATIVE MIDDLEEAR DISEASE. (SYNONYMS : SCLEROSIS OF THE MIDDLE EAR, DRY MIDDLE-EAR CATARRH, OTOSCLEROSIS, FIXATION OF THE STAPES, OTITIS METIA INSIDIOSA, CHRONIC PROGRESSIVE DEAFNESS, &amp;C.)
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