Also sometimes referred to as WHIRLYBIRDS.
Was the first helicopter approved for civilian use, & it was also the first helicopter to be used to transmit television signals for people viewing at home.
The Bell 47 helicopter entered U.S. military service in late 1946, in a variety of versions and designations for three decades. In the Korean War, it was designated the H-13 Sioux by the United States Army. It has also served as the helicopter of choice for basic helicopter flight instruction in many countries.