Automobile door-opening early warning and collision preventing device
Safe driving auxiliary system and safe driving auxiliary method for driver
Public transportation electronic station board system and method
Step chain idler wheel provided with protective covers
Slide rod type lightweight four-rotor unmanned aerial vehicle
Method and system for detecting person trapping in elevator
Coder, external diagnosis equipment and on-line diagnosis and adjustment method
Remote sensing emergency monitoring and commanding vehicle
Single magnetic type permanent magnet track braking device