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Unmanned aerial vehicle pesticide spraying device based on big data and use method thereof
Intelligent transparent display car window for high-speed rail
Rotor dynamic vibration absorber for inhibiting axial vibration
Collecting and purifying system for deashing operation at bottom of train
Double-valve-element integrated quick-closing broadside valve
Adjustable power-assisted car window limiter and limiting method
Hinge supporting and limiting mechanism suitable for various window cover structures
Battery compartment locking device capable of rapidly positioning and locking
Bulletproof vehicle door assembly and bulletproof vehicle
Ship-borne hydrological sediment factor measuring platform