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发明名称
Locking means
摘要
申请公布号
US2121230(A)
申请公布日期
1938.06.21
申请号
US19350030513
申请日期
1935.07.09
申请人
HAMON WESLIE M
发明人
HAMON WESLIE M.
分类号
E21B31/20;E21B43/10
主分类号
E21B31/20
代理机构
代理人
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地址
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