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发明名称
Derrick supporting member
摘要
申请公布号
US2308157(A)
申请公布日期
1943.01.12
申请号
US19380201015
申请日期
1938.04.08
申请人
STANDARD OIL DEVELOPMENT COMPANY
发明人
CUTHRELL ANTUM E.
分类号
B66C23/78;E04H12/00;E21B15/00
主分类号
B66C23/78
代理机构
代理人
主权项
地址
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