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person:("wang chaohui")
FOLDABLE AND RETRACTABLE MECHANISM, PROPELLER PROTECTION DEVICE, AND ROTOR UNMANNED AERIAL VEHICLE
Lampshade structures, unmanned aerial vehicle arms, unmanned aerial vehicles, and movable platforms
LAMPSHADE STRUCTURES, UNMANNED AERIAL VEHICLE ARMS, UNMANNED AERIAL VEHICLES, AND MOVABLE PLATFORMS
LAMPSHADE STRUCTURE, UNMANNED AERIAL VEHICLE ARM, UNMANNED AERIAL VEHICLE AND MOVABLE PLATFORM
Transaction system, processing method and related device for expressway
ETC parking online transaction system compatible with license identification equipment
Highway road condition monitoring and early warning device
Real-time monitoring system and method for running speed of vehicles on highway
Expressway ETC lane toll collection device and use method thereof
ETC (Electronic Toll Collection) equipment and use method thereof