Browse Items (32 total)

Photograph of a Learmatic navigator, circa 1940s.Inscription: "Learmatic navigator combining directional gyro with adjustable [illegible] and automatic and/or manual loop [rotator?]."

Photograph of a Learadio portable receiver, circa 1930s-1940s.Inscription: "Portable 2-band battery-operated receiver used thru-out WW2 by many USAF [personnel?] here and all over world."

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 in the cockpit of a Learadio Waco E Airistocrat aircraft, circa 1930s-1940s.

Photograph of a Learadio Model RCB receiver tuning unit, circa 1930s-1940s.

Photograph of a Learadio radio compass tuning unit, circa 1930s-1940s.

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 Piper J-4A Cub Coupe aircraft equipped with a Lear Avia loop antenna, circa 1940.Inscription: "Lear Avia manual loop. 1940."

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…