WATER SKI TRACTOR “DOLPHIN” WITH MECHANICAL COUPLING OF SKI, MONOSKI AND WAKEBOARD
WATER SKI TRACTOR “DOLPHIN” WITH ELECTROMAGNETIC COUPLING OF SKI
RADIO-HYDROACOUSTIC BUOY ON MICROCONTROLLERS WITH BASE DATA OF REFERENCE SIGNALS
RADIO-HYDROACOUSTIC BUOY ON MICROCONTROLLER WITH ACOUSTIC UNDERWATER COMMUNICATION UNIT
SUBMARINE HYDRO ACOUSTIC SUITE NOISE DIRECTION-FINDING SYSTEM
DEPTH-ACTIVATED SENSOR SWITCH AND METHOD OF SWITCHING IT OFF
NAVIGATIONAL RADIOOPTICAL ANGLE REFLECTOR OF DIRECTIONAL ACTION WITH LIGHT-REFLECTING FACES
NAVIGATION RADIO-OPTICAL GROUP REFLECTOR OF CIRCULAR ACTION