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经营范围
发明名称
Improvements in magnetic compasses
摘要
申请公布号
GB550314(A)
申请公布日期
1943.01.01
申请号
GB19420005415
申请日期
1942.04.22
申请人
ARVID JONSSON
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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