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经营范围
发明名称
Mine roof anchor having adjustable resin retaining washer
摘要
申请公布号
US4865489(A)
申请公布日期
1989.09.12
申请号
US19880229699
申请日期
1988.08.08
申请人
JENNMAR CORPORATION
发明人
STANKUS, JOHN C.;STEWART, EUGENE H.;GRISSINGER, GLEN S.
分类号
E21D20/02;E21D21/00
主分类号
E21D20/02
代理机构
代理人
主权项
地址
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