A device for controlling the height of a blade of a tracked vehicle includes a blade height position detector, a blade height controller for raising and lowering the blade, and a device for setting an initial height of the blade. When the transmission of the vehicle is shifted from the reverse to the...http://www.google.ca/patents/US5398766?utm_source=gb-gplus-sharePatent US5398766 - Device for controlling height of blade of tracked vehicle
