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发明名称
Lock and release device for hydraulically operated derricks
摘要
申请公布号
US2930489(A)
申请公布日期
1960.03.29
申请号
US19540449953
申请日期
1954.08.16
申请人
BROWN HOWARD D
发明人
BROWN HOWARD D.
分类号
B66C13/18
主分类号
B66C13/18
代理机构
代理人
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