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摘要
申请公布号
US2753833(A)
申请公布日期
1956.07.10
申请号
US19540477372
申请日期
1954.12.23
申请人
TINSLEY WILLIAM B
发明人
TINSLEY WILLIAM B.
分类号
E21B1/00
主分类号
E21B1/00
代理机构
代理人
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