Seminars in Hearing, Table of Contents Semin Hear 1996; 17(1): 91-101DOI: 10.1055/s-0028-1089930 Copyright © 1996 by Thieme Medical Publishers, Inc. Case Studies Using the Beltone Invisa CIC Hearing Aid Kenneth R. LaFerle Beltone Electronics, Chicago, Illinois. Recommend Article Abstract PDF Download Buy Article PDF (452 kb)