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发明名称
An improved magnetic compass
摘要
申请公布号
GB770984(A)
申请公布日期
1957.03.27
申请号
GB19550023160
申请日期
1955.08.11
申请人
MERLIN GRAHAM DUFF;RAYMOND HARRY MILWARD
发明人
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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