Question: The TT-30 pistol was developed in the early 1930's as a replacement to a revolver designed by who?
Sentence (from "TT pistol"): The TT-30 (Russian: "7,62-мм самозарядный пистолет Токарева образца 1930 года" , 7,62 mm Samozaryadnyj Pistolet Tokareva obraztsa 1930 goda, "7.62 mm Tokarev self-loading pistol model 1930", TT stands for Tula-Tokarev) is a Russian semi-automatic pistol.
Relevant evidence: No