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• Text (6)

• brochures (2)
• correspondence (2)
• pamphlets (1)
• reports (1)

• In copyright (6)

• Lear Developments (6)
• Aids to air navigation (4)
• Learadio (4)
• Radio in aeronautics (3)
• Radio--Transmitters and transmission (3)
• Marsen, Richard A. (2)
• Patents (2)
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• Lear, William P. (William Powell), 1902-1978 (1)
• Whanger, J. K. (1)

6 results

[Letter to Mr. J. K. Whanger from Richard A. Marsen, June 19, 1939] (Item)

Letter to Mr. J. K. Whanger, Lawrence Scudder and Company, from Richard A. Marsen, Lear Developments, June 19, 1939. Provides a "general outline of the patent situation at Lear Developments." Seven typed pages and original folder labeled "L-r2 / Reports - Scudder."

[Letter to William P. Lear from Richard A. Marsen, June 20, 1939] (Item)

Letter to William P. Lear from Richard A. Marsen, June 20, 1939. Recommends that the company take a more general tone when announcing and publicizing products in order to protect Lear Developments' patents. References an Associated Press release about the Blind Landing System. Two typed pages.

Learadio automatic landing field orientation device (Item)

Report about the Lear Developments automatic landing field orientation device, June 1939. Contains technical details about the device. Three typed pages on Learadio letterhead.

Learadio aircraft radio equipment [pamphlet] (Item)

Pamphlet about Learadio aircraft radio equipment, circa 1930s. Contains technical specifications and images of various models of transmitters, receivers, power supplies, and accessories. 41 pages.

[Brochure for Learadio Model T30-R3AB aircraft transmitter-receiver] (Item)

Brochure for the Learadio Model T30-R3AB aircraft transmitter-receiver, circa 1939.

[Brochure for Learadio Model UT-6 radio transmitter] (Item)

Brochure for the Learadio Model UT-6 radio transmitter, circa 1939.