[Piezoceramic emitter in an echolocator for the blind].
D001698:Biomedical Engineering; D001766:Blindness / Q000534:rehabilitation*; D002516:Ceramics; D012656:Self-Help Devices; D012666:Semiconductors; D014465:Ultrasonics
P'ezokeramicheskiĭ izluchatel' v ékho-lokatore dlia slepykh.