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发明名称
Navigational instrument
摘要
申请公布号
US2179531(A)
申请公布日期
1939.11.14
申请号
US19380220343
申请日期
1938.07.20
申请人
TRAPNELL FREDERICK M
发明人
TRAPNELL FREDERICK M.
分类号
G01C21/20
主分类号
G01C21/20
代理机构
代理人
主权项
地址
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