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发明名称
Packing device
摘要
申请公布号
US2231221(A)
申请公布日期
1941.02.11
申请号
US19370145711
申请日期
1937.06.01
申请人
RECTOR LAURENCE L
发明人
RECTOR LAURENCE L.
分类号
E21B33/00;E21B33/04
主分类号
E21B33/00
代理机构
代理人
主权项
地址
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