7.5 cm Pak 40 - 7.5 cm Panzerabwehrkanone 40 was developed by Rheinmetall from 1939 to 1941 amd used by the German forces since. Some were installed on armoured cars such as SdKfz 251/22 to give it mobility From mid WWII onwards, vehicle mounted version was developed (7.5 cm KwK 40) and mounted on tank and tank destroyers.