Barbe - Flying Machine, French Patent 395367 of 1909,
A French patent filing of 1909 by Dominique Louis Barbe for a flying machine with stacked rotors, drawn for examiners at the national patent office. The two sheets carry ink line drawings: elevation of a braced twin-rotor frame on a wheeled base, plan views of sectored and spoked discs, plus small detail sections, all numbered as figures on aged paper with clerks' stamped annotations.
