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经营范围
发明名称
Frog point
摘要
申请公布号
US1760465(A)
申请公布日期
1930.05.27
申请号
US19280303419
申请日期
1928.09.01
申请人
ANDERSON DAVID E
发明人
ANDERSON DAVID E.
分类号
E01B7/12
主分类号
E01B7/12
代理机构
代理人
主权项
地址
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