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经营范围
发明名称
Plug and feather construction
摘要
申请公布号
US2837079(A)
申请公布日期
1958.06.03
申请号
US19560562060
申请日期
1956.01.30
申请人
H. E. FLETCHER CO.
发明人
HORTON WILLIAM B.
分类号
E21C37/04
主分类号
E21C37/04
代理机构
代理人
主权项
地址
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