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发明名称
Directional instrument
摘要
申请公布号
US1932412(A)
申请公布日期
1933.10.31
申请号
US19300457957
申请日期
1930.05.31
申请人
ELIOT KEEN
发明人
KEEN ELIOT
分类号
G01C19/38
主分类号
G01C19/38
代理机构
代理人
主权项
地址
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