31 dic 1938 año - Helicopters
Descripción:
Igor Sikorsky is credited with invented the world’s first helicopter as we would recognise it. But the first record of a rotary winged craft dates back to the 4th Century in a book called “Pao Phu Tau” which describes a flying car kept in the air by spinning blades.Añadido al timeline:
fecha:
31 dic 1938 año
Ahora mismo
~ 86 years ago