He is an American electrical engineer and he invented the negative feedback amplifier in 1927.
Harold S. Black has written: 'Modulation theory' -- subject(s): Modulation theory, Telecommunication, Beef cattle, Heifers
Nothing
nothing!
Edward Binney and Harold Smith invented crayons in 1903.
Thomas Edison did not invent the electric chair Harold p brown did...
2012
He invented crayola crayons with his partner Harold Smith
Harold Stephen Black died on 1983-12-11.
Harold Stephen Black was born on 1898-04-14.
I think that Edward Binnie and Harold Smith invented crayolas/crayons wonted to make things colorful instead of black and white .Please leave comments on to prove if u think im wrong or any thing.
Harold S. Ferguson was born in 1851.
Harold S. Ferguson died in 1921.