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经营范围
发明名称
Improvements in and relating to electromagnetic compasses
摘要
申请公布号
GB342038(A)
申请公布日期
1931.01.29
申请号
GB19290035337
申请日期
1929.11.19
申请人
THE BRITISH THOMSON-HOUSTON COMPANY, LIMITED
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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