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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Two models of cartilage conduction hearing aids used in clinical practice: HB-J1CC (upper) and HB-A2CC (lower). Both models have three transducer types: ear-chip embedded (left), ear-chip attachment (middle), and simple vibrator (right).