1. Application of Hydraulic Pressure System of Umbrella Drill to the Construction of Shaft in Hard Rock
液压伞钻在立井硬岩段施工中的应用测井绞车液压传动系统的设计和创新
2. Current Status of the Homemade Rock Drilling Machine Development of Chiaa's umbrella masts
我国凿岩机械现状我国伞形钻架的发展