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发明名称
SINKING OF MINE SHAFTS
摘要
申请公布号
ZA8804973(B)
申请公布日期
1989.03.29
申请号
ZA19880004973
申请日期
1988.07.11
申请人
SHAFT SINKERS (PROPRIETARY) LIMITED
发明人
GLEN DAVID GRIESEL
分类号
B66B;E21D
主分类号
B66B
代理机构
代理人
主权项
地址
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