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发明名称
Screw wedge burster
摘要
申请公布号
US2954219(A)
申请公布日期
1960.09.27
申请号
US19580718355
申请日期
1958.02.28
申请人
JOY MANUFACTURING COMPANY
发明人
ZACUR ALEX O.
分类号
E21C25/58
主分类号
E21C25/58
代理机构
代理人
主权项
地址
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