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发明名称
Folding derrick base
摘要
申请公布号
US2300480(A)
申请公布日期
1942.11.03
申请号
US19410406273
申请日期
1941.08.11
申请人
LEE C. MOORE & COMPANY, INC.
发明人
WOOLSLAYER HOMER J.;CAMPBELL ERWIN A.;JENKINS CECIL
分类号
E04H12/00;E21B15/00
主分类号
E04H12/00
代理机构
代理人
主权项
地址
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