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发明名称
Explosively actuated expanding mine roof fastener
摘要
申请公布号
US2813449(A)
申请公布日期
1957.11.19
申请号
US19500154159
申请日期
1950.04.05
申请人
JOY MANUFACTURING COMPANY
发明人
BARRETT A LEE
分类号
E21D21/00
主分类号
E21D21/00
代理机构
代理人
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