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发明名称
Torsion pit prop
摘要
申请公布号
US2890854(A)
申请公布日期
1959.06.16
申请号
US19570632285
申请日期
1957.01.03
申请人
GUTEHOFFNUNGSHUTTE STERKRADE AKTIENGESELLSCHAFT
发明人
VOGEL RUDOLF T.
分类号
E21D15/32
主分类号
E21D15/32
代理机构
代理人
主权项
地址
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