Alexander Graham Bell was a successful inventor and made breakthroughs with helicopters and hydrofoils. Definitely not a one trick pony.
IIRC, Bell ended up wanting to spend his life after inventing the telephone as a scientist and a researcher, rather than tending to the running of Bell Telephone and AT&T.
IIRC, Bell ended up wanting to spend his life after inventing the telephone as a scientist and a researcher, rather than tending to the running of Bell Telephone and AT&T.