Automatic tensioning device and automatic tensioning hand strap
Driving mechanism stabilizing system of moving sidewalk or escalator
Novel escalator test weight and full-load test device composed of weights
Single-point traffic signal control method based on intersection holographic data
Intelligent fire-extinguishing unmanned aerial vehicle for communication wires and cables
Side bearing hole supporting mechanism of diesel locomotive underframe
High-strength hanging-type fuel oil tank of internal combustion locomotive