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[William P. Lear and man with sections of SAAC-23 mock-up]
Photograph of William P. Lear (right) and an unidentified man with sections of a SAAC-23 mockup, circa 1961.
[Men working on sections of SAAC-23 mock-up]
Photograph of men working on sections of a SAAC-23 mockup, September 29, 1961.Inscription on verso: "9-29-61."
[Cockpit mock-up of SAAC-23 aircraft]
Photograph of a cockpit mockup of the SAAC-23 aircraft, July 29, 1961.Inscription on verso: "7-29-61."
[SAAC-23 mock-up]
Photograph of a SAAC-23 mockup, July 28, 1961.Inscription on verso: "7-28-61."
[Man measuring section of SAAC-23 mock-up]
Photograph of a man measuring a section of a SAAC-23 mockup, circa 1961.
[William P. Lear with SAAC-23 mock-up]
Photograph of William P. Lear with a SAAC-23 mockup, circa 1961.
[Test fuselage of Learjet 23 prototype undergoing structure testing]
Photograph of the test fuselage of the Learjet 23 prototype undergoing structure testing at a Lear facility, March 17, 1964.Inscription: "T76-1B / 3-17-64."Inscription on verso: "Structure testing."
[Men conducting tests on Learjet 23 prototype]
Photograph of three men conducting tests on the Learjet 23 prototype, March 16, 1964.Inscription on verso: "Flight test instruction for ground test / T-76-3A / 3-16-64."
[Test fuselage of Learjet 23 prototype]
Photograph of the test fuselage of the Learjet 23 prototype at a Lear facility, February 29, 1964.Inscription on verso: "Overall shot of test fuselage / 2-29-64."
[Learjet 23 aircraft during flight test at Lear facility]
Photograph of a Learjet 23 aircraft (tail number N801L) during a flight test at a Lear facility, January 1964. Details about the aircraft and its flight tests are provided in the caption.Typed caption on verso: "Fifty-Hour Milestone: Latest photo of Lear Jet being put through its paces for recent high-speed tests and flutter analysis during which it logged 50th hour. / The maximum level-flight…