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person:("Liu, zhenyu")
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person:("Liu, chunyu")
Parking space management system based on artificial intelligence
Traffic intelligent management and control method and device based on big data and storage medium
Double-layer jack type jacking rescue device and method
Underwater equipment convenient for adjusting counterweight buoyancy
MODULAR FLOTATION DEVICE WITH MECHANISM TO REMOVABLY ATTACH TO OTHER MODULAR DEVICES
MODULAR FLOTATION DEVICE WITH MECHANISM TO REMOVABLY ATTACH TO OTHER MODULAR DEVICES