37 mm KPÚV (Kanón Proti Útočné Vozbě) vz. 37: Czechoslovakian anti-tank gun
The 3,7 cm KPÚV vz. 37 was an anti-tank gun produced by the Škoda Works that saw service in World War II. Originally designed for the Czechoslovak Army, some were also sold to Yugoslavia. A number were appropriated by the Germans after the German occupation of Czechoslovakia in 1939 and used under the designations 3,7 cm PaK 37 (t).
Captured Yugoslav guns were used under the designation of 3,7 cm Pak 156 (j). Slovakia acquired 158 when it declared independence from Czechoslovakia in March 1939.