model-10-electra-prototype.jpg.pc-adaptive.1280.medium Published on February 26, 2019 in Clarence Leonard (“Kelly”) Johnson (27 February 1910–21 December 1990)Full resolution (1280 × 970) ← Previous Next → The prototype Lockheed Model 10 Electra, NX233Y, during flight testing over Southern California, 1934. (Lockheed Martin)