(under subclass 63) Method or apparatus wherein the barrier can be shifted from a floating orientation to a position completely beneath the water surface.
SEE OR SEARCH THIS CLASS, SUBCLASS:
23, for wave dissipators.
171, for subject matter relating to submerging a line of pipe or cable by controlling the buoyancy of the same.
205+, for marine structures which are floated to a site and sunk into an operative position.
