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发明名称
Adjustable jib mounting for rock drills
摘要
申请公布号
US3212738(A)
申请公布日期
1965.10.19
申请号
US19630268688
申请日期
1963.03.28
申请人
JOY MANUFACTURING COMPANY
发明人
CURTIS JOHN CLARK;PARSSINEN TOIMI A.
分类号
E21B7/02
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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