Acting directly on the eardrum, the ossicles or the skull

Official title: {acting directly on the eardrum, the ossicles or the skull, e.g. mastoid, tooth, maxillary or mandibular bone, or mechanically stimulating the cochlea, e.g. at the oval window}

H04R25/606 (Acting directly on the eardrum, the ossicles or the skull) appears on 1,433 US grants and 1,669 published applications in this corpus.