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Drilling and injection dual-purpose sleeve valve pipe, sleeve valve pipe construction structure and construction method
Free accessEuropean Patent Office | 2020| -
Guiding device for SMW construction method pile construction and SMW construction method pile construction equipment and method
Free accessEuropean Patent Office | 2020| -
Shield tunneling machine main drive inner seal leakage blocking construction method
Free accessEuropean Patent Office | 2022| -
Construction protection method at one side of existing building
Free accessEuropean Patent Office | 2020| -
Oil and gas wellhead device with liquid drainage function and liquid drainage method of oil and gas wellhead device
Free accessEuropean Patent Office | 2023| -
Filling backwater potential energy recovery energy-saving device
Free accessEuropean Patent Office | 2021| -
Transverse-expansion-deformation-resistant deeply-buried shield tunnel structure suitable for soft soil body area
Free accessEuropean Patent Office | 2022| -
Tunnel structure construction method based on mine method underpinning pile foundation
Free accessEuropean Patent Office | 2021| -
Round rock breaking vertical shaft full face heading machine cutterhead
Free accessEuropean Patent Office | 2021| -
Method for preventing and treating blockage of high-depth draw shaft
Free accessEuropean Patent Office | 2021| -
Variable-frequency driving system and method for direct-drive screw pump oil pumping unit
Free accessEuropean Patent Office | 2022| -
Device and method for identifying installation position of arch frame
Free accessEuropean Patent Office | 2020| -
Vertical shaft heading machine cutterhead suitable for non-homogeneous stratum
Free accessEuropean Patent Office | 2021|
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