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发明名称
Frame structure
摘要
申请公布号
US2632532(A)
申请公布日期
1953.03.24
申请号
US19460697370
申请日期
1946.09.16
申请人
BLACKBURN LUTHER A
发明人
BLACKBURN LUTHER A.
分类号
E21B1/00
主分类号
E21B1/00
代理机构
代理人
主权项
地址
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