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发明名称
Packing device
摘要
申请公布号
US2295770(A)
申请公布日期
1942.09.15
申请号
US19410374471
申请日期
1941.01.15
申请人
BAKER OIL TOOLS, INC.
发明人
BAKER REUBEN C.
分类号
E21B33/12
主分类号
E21B33/12
代理机构
代理人
主权项
地址
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