POSITION CONTROL APPARATUS OF UNMANNED MARINE OBSERVATION APPARATUS AND CONTROLLING METHOD THEREOF
Electrically-powered unmanned marine vehicle and method of making same
ELECTRICALLY-POWERED UNMANNED MARINE VEHICLE AND METHOD OF MAKING SAME
Rim-driven propulsion system with low friction power consumption
High-thrust rim propeller and advancing tool adopting same
BUBBLE GENERATION DETECTOR AND BUBBLE GENERATION DETECTING METHOD