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发明名称
Side wall drilling organization
摘要
申请公布号
US1804819(A)
申请公布日期
1931.05.12
申请号
US19280274406
申请日期
1928.05.02
申请人
SPENCER JR EDWARD A;FAY OLIVER
发明人
JR. EDWARD A. SPENCER,;OLIVER FAY
分类号
E21B49/06
主分类号
E21B49/06
代理机构
代理人
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