Before revision: Crop dusting Lt. Macready (right) and McCook Field engineer E. Dormoy (left) in front of the 1st crop duster airplane (August 3, 1921)|right The first known use of a heavier-than-air machine to disperse products occurred on August 3, 1921.
After revision: Crop dusting The first known use of a heavier-than-air machine to disperse products occurred on August 3, 1921.