Raúl Pateras Pescara

[4] On January 16, 1924, at Issy-les-Moulineaux near Paris, Pescara broke his own world record for helicopter flight with his model 2F, The Marquis Pateras, by remaining in the air 8 minutes and 13 4/5 seconds, whilst flying 1,160 metres (3,810 ft; 0.72 mi) in a vertical line.

"[5] On January 29, 1924, whilst attempting to win the French Aero Club prize for a 1-kilometre (0.62 mi) closed circuit, Pescara completed the course in 10 minutes, 33 seconds, but was not permitted to qualify due to his machine's brief contact with the ground.

[1] In 1929, together with his brother Henri, the Italian engineer Edmond Moglia and the Spanish government, Pescara founded La Fábrica Nacional de Automóviles ("National Automobile Factory") with an investment of 70 million pesetas.

[11] The auto-compressor company remained in business for 30 years, supported by six French patents [12] with one of its shareholders, and the Pescara & Raymond Corporation, based in Dover, Delaware, USA.

Free-piston engines received new attention when they were mass-produced by the Société Industrielle Générale de Mécanique Appliquée (SIGMA), a French company that developed the GS-34, a 1138-horsepower generator.