Knowing the flaws of TK-3 tankette, Polish designers begun to study on new, better version of this tiny fighting vehicle. In 1933 they came up with the TKS tankette. The main difference was a better suspension, engine and different front shape. The tankette also used Gundlach periscope, now used in most of the modern tanks. Still, it had light armour and only one 7,92 mm machine gun for self-defence.
Knowing that Hitler is planning a massive armoured vehicles production, the Ursus workers begun to replace the machine guns with 20 mm anti-tank cannons. The TKS tankette became the world first vehicle dedicated only to destroy tanks. Panzers I and II were helpless against this weapons, and from close range it could even disable a Panzer III and IV. Germans later learned from Polish experience, building their own tank destroyer - Panzerjager I.