CAMERA DEVICE FOR HEAVY MACHINE AND HEAVY MACHINE ON WHICH CAMERA DEVICE IS INSTALLED
CHARGING RECHARGEABLE BATTERY OF UNMANNED AERIAL VEHICLE IN FLIGHT USING HIGH VOLTAGE POWER LINE
CHARGING STATION AND CHARGING STATION GUIDANCE DEVICE FOR UNMANNED WORK VEHICLE
COMMUNICATION DEVICE, CONTROL METHOD THEREOF, AND PROGRAM
COMMUNICATION RELAY METHOD, RELAY FLYING BODY, PROGRAM AND RECORDING MEDIUM
COMMUNICATION SYSTEM INCLUDING PLURAL UNMANNED AIRCRAFTS