United Airport brochure and first flight air mail cover addressed to William E. Boeing, Seattle, Washington, April 30, 1931.Stamped: "First Flight A.M. Route 4 from United Airport, Burbank, California."Stamped: "First Dispatch - Airmail Field Post…
Brochure containing six advertisements for Lear Avia and Lear, Incorporated products, circa 1944. The ads describe the wartime utility of electric motors and actuators, and ask potential customers for ideas on how the products can be similarly useful…