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METHOD OF PRESSSIN PROPULSIVE CONSTRUCTION OF UNDERGROUND BURIED PIPE* SUCH AS* WATERRWORKS* SEWERAGE* GAS* ETC* ONTO WEAK GROUND* SUCH AS* SILT* ETC* AND GRAVEL LAYER GROUND WITH MUCH GROUNDDWATER AN
METHOD OF PRESSSIN PROPULSIVE CONSTRUCTION OF UNDERGROUND BURIED PIPE* SUCH AS* WATERRWORKS* SEWERAGE* GAS* ETC* ONTO WEAK GROUND* SUCH AS* SILT* ETC* AND GRAVEL LAYER GROUND WITH MUCH GROUNDDWATER AN
