Variants of the Polish TKS and TK-3 tankettes up-armed with 20 mm gun (23–26 vehicles) were operationally deployed in the invasion of Poland.
Variantes das tanquetas polacas TKS e TK-3 armadas cun canón de 20 mm (entre 23 e 26 vehículos) foron despregadas durante a invasión de Polonia.