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发明名称
Navigation instrument
摘要
申请公布号
US1949403(A)
申请公布日期
1934.03.06
申请号
US19310579720
申请日期
1931.12.08
申请人
ASHLOCK ERNEST H
发明人
ASHLOCK ERNEST H.
分类号
G01C21/02
主分类号
G01C21/02
代理机构
代理人
主权项
地址
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