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发明名称
Crown block
摘要
申请公布号
US1841792(A)
申请公布日期
1932.01.19
申请号
US19300491958
申请日期
1930.10.29
申请人
EMSCO DERRICK & EQUIPMENT COMPANY
发明人
DAVIDSON WILLIAM D.
分类号
B66D3/06
主分类号
B66D3/06
代理机构
代理人
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地址
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