Ball friction-reducing sleeve protective device
HU LIANGYI, LIU TIAN, YANG HEMIN, HUANG TAO, CHEN PO, DENG YUN, WANG YONGGANG, YU LIHU
Year of Publication 03.08.2011
Get full text
Year of Publication 03.08.2011
Patent
Sand-proof pipe external gravel filling sand-proof well-washing compensator
LI SHANKUI, HU KEPING, YANG HEMIN, LIN YANPING, ZHAO LICHUN, LI HU, JIN PENG, TAO PAN, LIU XIAOGANG, CHEN LIDONG, DENG JIANGNING, WANG ZHENQING, ZHANG SHIXUE, ZHANG XINHUA, JIANHUA REN, ZHANG ZHILIANG, WANG RENQIAN, HUA, ZHANG YIQIANG, WANG LANLIANG, TAO NG, JIANGUANG HAO, YU SHOUPING
Year of Publication 08.02.2006
Get full text
Year of Publication 08.02.2006
Patent