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发明名称
Magnetic compass
摘要
申请公布号
US1799648(A)
申请公布日期
1931.04.07
申请号
US19280290301
申请日期
1928.07.05
申请人
SALZGEBER GUSTAVE A
发明人
SALZGEBER GUSTAVE A.
分类号
G01C17/00
主分类号
G01C17/00
代理机构
代理人
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