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发明名称
Releasing overshot
摘要
申请公布号
US2753208(A)
申请公布日期
1956.07.03
申请号
US19520303359
申请日期
1952.08.08
申请人
BUS SR FRANKLYN L LE
发明人
SR. FRANKLYN L. LE BUS,
分类号
E21B31/18
主分类号
E21B31/18
代理机构
代理人
主权项
地址
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