… floating cranes and other vessels the navigability of which is subsidiary to their main function; floating docks; …
Explanatory notes
… floating cranes, and other vessels the navigability of which is subsidiary to their main function; floating docks; … pontoons fitted with lifting or handling machines (e.g., derricks, cranes, grain elevators) and pontoons clearly … These are used for the repair or transport of amphibious vehicles or other craft. (C) Floating or submersible …