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发明名称
Improvements in and relating to shaft supports for crown block constructions
摘要
申请公布号
GB330263(A)
申请公布日期
1930.06.04
申请号
GB19290006922
申请日期
1929.03.04
申请人
EMSCO DERRICK & EQUIPMENT COMPANY
发明人
分类号
B66D3/06
主分类号
B66D3/06
代理机构
代理人
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