Beltone "Overture" Behind-the-Ear Hearing Aid The Beltone "Overture" behind-the-ear hearing aid was produced by the Beltone Electronics Corp. of Chicago, IL in 1970. It was a 3-transistor model. The words "Beltone" and "Overture" are molded into the side of the case near the top. The forward-facing microphone opening is in the clear plastic above the ear hook. |  | Click picture for larger view | | | | |