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发明名称
Magnetic compass
摘要
申请公布号
US2294355(A)
申请公布日期
1942.08.25
申请号
US19400359380
申请日期
1940.10.02
申请人
HULL WALTER E
发明人
HULL WALTER E.
分类号
G01C17/00
主分类号
G01C17/00
代理机构
代理人
主权项
地址
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