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House building engineering foundation pit construction soil punching device
Free accessEuropean Patent Office | 2023| -
Ball-throwing type blowout-prevention vacuum single-pipe coring drilling tool and coring operation method
Free accessEuropean Patent Office | 2020| -
Reverse seepage retaining wall process for loose stratum tube well construction
Free accessEuropean Patent Office | 2021| -
Semi-closed type bionic rock core inner pipe and machining method thereof
Free accessEuropean Patent Office | 2021| -
Double-channel side-spraying PDC (polycrystalline diamond compact) drill bit for drilling and coring in argillization interlayer stratum
Free accessEuropean Patent Office | 2022| -
Double-pipe side spraying PDC drill bit for clear water drilling clayish interlayer coring
Free accessEuropean Patent Office | 2020|
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