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发明名称
Screw-type brake-operating mechanism for draw works
摘要
申请公布号
US1792617(A)
申请公布日期
1931.02.17
申请号
US19290367782
申请日期
1929.06.01
申请人
EMSCO DERRICK & EQUIPMENT COMPANY
发明人
TREMOLADA GUGLIELMO
分类号
B66D5/00
主分类号
B66D5/00
代理机构
代理人
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地址
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