Question: The CASA 2. 111 was a medium bomber derived from what German aircraft that was designed by Siegfried and Walter Gunter at Heinkel Flugzeugwerke in 1934?
Sentence (from "CASA 2.111"): The 2.111 models differed significantly in details from Heinkel's wartime He 111H design while using essentially the same exact airframe in appearance, featuring heavier armament and eventually Rolls-Royce Merlin engines.
Relevant evidence: No