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发明名称
Supporting step
摘要
申请公布号
US2437012(A)
申请公布日期
1948.03.02
申请号
US19460690237
申请日期
1946.08.13
申请人
WHITE RAYMOND J
发明人
WHITE RAYMOND J.
分类号
E21B19/12;E21B41/00
主分类号
E21B19/12
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