Question: Who canceled the project for the Landkreuzer P. 1000 Ratte, which would have surpassed the Panzer VIII Maus as being the heaviest fully enclosed armoured fighting vehicle ever built?
Sentence (from "Kampfwagenkanone"): However, the present-day designation in German speaking armed forces to this particular weapon system is Panzerkanone (en: tank gun).
Relevant evidence: No