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发明名称
Mine prop prestressing means.
摘要
申请公布号
ZA9907159(B)
申请公布日期
2000.06.13
申请号
ZA19990007159
申请日期
1999.11.17
申请人
DERGLEN CC
发明人
RONALD RAYMOND COHEN
分类号
E21D
主分类号
E21D
代理机构
代理人
主权项
地址
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