a mere toy, and in 1894 he persuaded a group of businessmen to invest $25,000, with which he started the United States Gramophone Company.

Rotary engine and helicopters

Berliner also developed a rotary engine and an early version of the helicopter. According to a July 1, 1909, report in The New York Times, a helicopter built by Berliner and J. Newton Williams of Derby, Connecticut,

1.Previous
3.Next