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person:("LIU hongwei")
Wireless electric control system for upgrading and refitting bicycle into power-assisted bicycle
Intelligent brake lamp control method, device and system and electronic equipment
Movable medical and sanitary product production waste collecting tank
Mooring and positioning device for wharf boat or structure
Vehicle urban route statistical method, system and equipment based on big data and medium
CHARGING METHOD FOR VEHICLE-MOUNTED INTELLIGENT REAR TRUNK