Ye-1 (1954) Ye-2 (1954, NATO name "Faceplate") Ye-2A (1955) MiG-23 (1957, all units reused for test programs) Ye-4 (1955, delta wing prototype of MiG-21) Ye-50(1956, high altitude interceptor experiment) Ye-50A (1956, refined Ye-50) Ye-5 (1956) MiG-21 (1956, first production fighters, five built. Focus moved to F variant)
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