Firestone XR-14
The Firestone XR-14 was a proposed 1940s American lightweight helicopter , designed by the Firestone Aircraft Company to operate in the liaison and observation helicopter for the United States Army Air Forces . 
<triplet> Firestone XR-14 <subj> American <obj> country <triplet> Firestone Aircraft Company <subj> American <obj> country <triplet> United States Army Air Forces <subj> American <obj> country