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发明名称
Yieldable mine supports
摘要
申请公布号
ZA9308354(B)
申请公布日期
1994.06.08
申请号
ZA19930008354
申请日期
1993.11.09
申请人
HL & H TIMBER PRODUCTS (PROPRIETARY) LIMITED
发明人
FRANS ROELOF PETRUS PIENAAR
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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