12 COMMERCIAL UNDERWATER EQUIPMENT, NAMELY, REMOTELY OPERATED UNDERWATER VEHICLES, SUBMARINE VEHICLES IN THE NATURE OF RESCUE SUBMERSIBLES, SUBMARINE VEHICLES IN THE NATURE OF TRENCHERS, SUBMARINE VEHICLES IN THE NATURE OF PLOWS; COMMERCIAL UNDERWATER EQUIPMENT, NAMELY, REMOTELY OPERATED UNDERWATER VEHICLES, SUBMARINE VEHICLES IN THE NATURE OF RESCUE SUBMERSIBLES, SUBMARINE VEHICLES IN THE NATURE OF TRENCHERS, SUBMARINE VEHICLES IN THE NATURE OF PLOWS WITH OPERATING CONTROLS SOLD AS A UNIT THEREWITH, AND COMPONENT PARTS THEREFOR; BUT NOT INCLUDING ANY EQUIPMENT SUPPLIED TO THE UNITED STATES GOVERNMENT