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发明名称
Packer
摘要
申请公布号
US2150228(A)
申请公布日期
1939.03.14
申请号
US19360098802
申请日期
1936.08.31
申请人
LAMB LUTHER F
发明人
LAMB LUTHER F.
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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