with rollers creating a surface load on the ground, e.g. steadily increasing surface load, for triggering purposes

Full Title

Defence installations; Defence devices (constructional aspects see Section E, e.g. E04H9/04; ) > Means for clearing land minefields; Systems specially adapted for detection of landmines > Self-propelled mine-clearing vehicles; Mine-clearing devices attachable to vehicles > with rollers creating a surface load on the ground, e.g. steadily increasing surface load, for triggering purposes