Übersetzen...
Automatische Übersetzung:
This American agricultural helicopter uses the downwash of its main rotor blades to swirl DDT-laden dust on to the underside of crop foliage. It can dust between 100 and 200 acres an hour. It can also be used to check plant disease and weeds, apply fertiliser, sow seed, pollenise orchards and blow moisture from rain-laden fruit. July 10, 1947. (Photo by Associated Press Photo).