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发明名称
Rotary percussion drill
摘要
申请公布号
US2584331(A)
申请公布日期
1952.02.05
申请号
US19500196318
申请日期
1950.11.17
申请人
ERNEST CRAIG
发明人
CRAIG ERNEST
分类号
B25D11/06;E21B1/20
主分类号
B25D11/06
代理机构
代理人
主权项
地址
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