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发明名称
YIELDABLE ROOF SUPPORT SPRAG
摘要
申请公布号
PL320312(A1)
申请公布日期
1998.12.07
申请号
PL19970320312
申请日期
1997.05.30
申请人
GWIAZDA JAN BOGUSLAW;GWIAZDA ALEKSANDER STANISLAW
发明人
GWIAZDA JAN BOGUSLAW;GWIAZDA ALEKSANDER STANISLAW
分类号
E21D11/28;(IPC1-7):E21D11/28
主分类号
E21D11/28
代理机构
代理人
主权项
地址
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