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发明名称
COMPENSATING DEVICE FOR MAGNETIC COMPASSES
摘要
申请公布号
CA299378(A)
申请公布日期
1930.04.15
申请号
CAD299378
申请日期
申请人
THE PIONEER INSTRUMENT CO.
发明人
M. M. TITTERINGTON
分类号
主分类号
代理机构
代理人
主权项
地址
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