Search Digital Records

• Rights > No copyright - United States (remove)
• Subject > Aids to air navigation (remove)

Limit your search

• Mixed Materials (1)
• Still Image (1)

• patents (1)
• photographic prints (1)

• No copyright - United States (2)

• Aids to air navigation (2)
• Airplanes--Parts (1)
• Lear, Inc. (1)
• Learadio (1)
• Navigation (Aeronautics) (1)

2 results

[William P. and Moya Olsen Lear Papers, Box 28, Folder 5 - Direction finders, 1926-1941] (Item)

Items from Box 28, Folder 5 of the William P. and Moya Olsen Lear Papers, 1926-1941. Contains patent documentation for various aircraft and radio systems: Joseph Dugan's synchronous bomb sight, Dugan's radio direction and position indicating system, William L. Jacke's automatic radio tuning control, John H. Hammond Jr.'s system of radiodirective control, Warren S. Eaton's radiodynamic orientation…

[Lear 3-axis servo unit] (Item)

Photograph of a Lear 3-axis servo unit, circa 1940s-1950s. Typed caption: "One of the first 3-axis servo units."