Development of a medium tank (working designation 20/25TP) started in Poland in January 1937. The Armament and Equipment Committee of the Polish Ministry of Military Affairs (KSUS, as abbreviated in Polish) suggested two versions of the vehicle. The second version featured 50 mm armor and an improved power unit. Existed only in blueprints.
Time for the successive autoreloading of each shell into the magazine.
The technical characteristics shown are for the Siege mode
Characteristics are specified for a vehicle with crew members trained to 100%.