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发明名称
Core drill
摘要
申请公布号
US2135737(A)
申请公布日期
1938.11.08
申请号
US19330666265
申请日期
1933.04.15
申请人
REED ROLLER BIT COMPANY
发明人
STOKES JOHN C.
分类号
E21B25/04
主分类号
E21B25/04
代理机构
代理人
主权项
地址
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