Written by
in
(Original Caption) Hearing Aids used by Beethoven are shown. They were designed between 1812 and … [+] 1814 by Beethoven’s friend, Johann Nepomuk Maelzel, (1772-1783), the inventor of the metronome. actually, the hearing aids were of little…
You must be logged in to post a comment.
Leave a Reply
You must be logged in to post a comment.