Question: For which war was the 71 calibre tank gun developed by a prominent 400 year old German dynasty?
Sentence (from "8.8 cm KwK 43"): The 8.8 cm KwK 43 L/71 (Kampfwagenkanone —"fighting vehicle cannon") was an 88 mm 71 calibre tank gun designed by Krupp and used by the German Wehrmacht during the Second World War.
Relevant evidence: Yes