A cutting-head suction-dredger comprises a floating body, a ladder and a cutting-head carried by the lower end of the ladder. The ladder supports against the floating body through a rail guide which is adapted to tilt with respect to the floating body and which extends in the direction of length of the...http://www.google.fr/patents/US4084334?utm_source=gb-gplus-shareBrevet US4084334 - Suction dredge with swell compensating ladder mount
Suction dredge with swell compensating ladder mount
