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摘要
申请公布号
US1893600(A)
申请公布日期
1933.01.10
申请号
US19270206280
申请日期
1927.07.16
申请人
SHELL PERFORATING COMPANY
发明人
SHULL DANIEL L.
分类号
E21B47/09
主分类号
E21B47/09
代理机构
代理人
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