Hard-of-hearing aid and Transistor hearing aid

Transistor hearing aid and hard-of-hearing aid are semantically related in mechanical listening device topic. In some cases you can use "Transistor hearing aid" instead a noun phrase "Hard-of-hearing aid".

Hard-of-hearing aid and transistor hearing aid are semantically related in mechanical listening device topic. You can use "Hard-of-hearing aid" instead a noun phrase "Transistor hearing aid".