From code one
Interesting bit of text with the first pic;
"The L-133 was Lockheed's initial design study for a jet propelled fighter. Design objectives included 600 mph top speed, 40,000-foot altitude, four 20mm canon, three hours endurance, no takeoff assistance, and one-pilot crew. Lockheed also designed the engine, designated L-1000. The final design had a takeoff gross weight of 18,000 pounds. In evolving the design, Lockheed built a similar, 3/4-scale, propeller-driven configuration (shown lower right). The design effort began in January 1942."
Does anyone know more about the demonstrator? Do any photos exist?