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发明名称
Water cooled cathead
摘要
申请公布号
US2320901(A)
申请公布日期
1943.06.01
申请号
US19400339505
申请日期
1940.06.08
申请人
EMSCO DERRICK & EQUIPMENT COMPANY
发明人
WEBSTER SAMUEL W.
分类号
B66D1/74;B66D5/02
主分类号
B66D1/74
代理机构
代理人
主权项
地址
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