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经营范围
发明名称
Liquid magnetic compass
摘要
申请公布号
GB507889(A)
申请公布日期
1939.06.22
申请号
GB19380037102
申请日期
1938.12.21
申请人
JOHANNES BOYSEN;OTTO KUHLMANN;THEODOR CHRISTIAN PLATH
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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