The TT-30 pistol was developed in the early 1930's as a replacement to a revolver designed by who?
TT pistol:  It was developed in the early 1930s by Fedor Tokarev as a service pistol for the Soviet military to replace the Nagant M1895 revolver that had been in use since Tsarist times, though it ended up being used in conjunction with rather than replacing the M1895. Nagant M1895: The Nagant M1895 Revolver was a seven-shot, gas-seal revolver designed and produced by Belgian industrialist Léon Nagant for the Russian Empire.
Léon Nagant