Ear trumpet and Hard-of-hearing aid

Ear trumpet noun - A conical acoustic device formerly used to direct sound to the ear of a hearing-impaired person.

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

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