diver sonar, namely, sonar for underwater divers using ultrasonic wave; sonar using ultrasonic wave; communication device used in underwater, namely, sensor for underwater communication using ultrasonic wave; Sensor for monitoring underwater sediment using ultrasonic wave; Altimeters; imaging sonar using ultrasonic wave; Echo sounders using ultrasonic wave for use underwater; Ultrasonic sensors

'altimet':36 'communic':15,24 'devic':16 'diver':1,7 'echo':42 'imag':37 'monitor':30 'name':3,20 'sediment':32 'sensor':21,28,51 'sonar':2,4,11,38 'sounder':43 'ultrason':9,13,26,34,40,45,50 'underwat':6,19,23,31,49 'use':8,12,17,25,33,39,44,48 'wave':10,14,27,35,41,46

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