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classificationCode:"ipc:f16n"
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classificationCode:"ipc:f16l"
ABS magnetic ring combined sealing element of automobile hub unit
Floating equipment and method for ocean surface flow field monitoring
PICP dry etching power-off helium leakage detection equipment
Plugging device for petroleum pipeline construction and detection method of plugging device
Sealing ring assembly for vehicle, vehicle and sealing performance detection method