Photograph of a swept antenna on the underside of a Fairchild 24 aircraft, circa 1939. A person, mostly out of frame, points to the antenna from the image's left side.Inscription: "First swept antenna on Fairchild 24. 1939."
Photograph of a Learadio Beech 17R Staggerwing aircraft, circa 1930s-1940s.Stamped on verso: "Please credit Hans Groenhoff, [crossed out telephone number and address in New York City, New York]."Note attached to verso: "[letterhead: Norman Warren] /…
Photograph of a Learadio Beech 17R Staggerwing aircraft, circa 1930s-1940s.Stamped on verso: "Please credit Hans Groenhoff, [crossed out telephone number and address in New York City, New York]."
Photograph of William P. Lear (at podium) addressing members of the Southern California Section of the Aircraft Remote Controls group, April 16, 1943. Inscription on verso: "Apr. 16, 1943. Aircraft Remote Controls. So. California Section."
Photograph of William P. Lear (at head of table) and members of the executive board at Lear Avia's Dayton Airport facility, Ohio, circa 1940. Other identified individuals are Rober L. Drake, Alice Miller, Arling "Arlie" Ryberg, and Waldorf Astoria…
Photograph of Arling W. Ryberg, Chief Mechanical Engineer of Lear Avia, working in his office, circa 1940. Drafting tools and device components are visible on his desktop.Inscription: "Arlie Ryberg. 1940."Typed caption on verso: "A. W. Ryberg, Chief…
Photograph of Robert L. Drake, Chief Electrical Engineer of Lear Avia, working in his office, circa 1940s. Typed caption on verso: "R. L. Drake, Chief Electrical Engineer, in his office."Inscription on verso: "Drake in his own office."
Photograph of William P. Lear (far left) and three other Lear Avia salesmen at Dayton Airport, Ohio, circa 1941. Four aircraft are visible behind the men, including a Monocoupe aircraft (tail number NC11760) and two unidentified Learadio…