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发明名称
Magnetic compass
摘要
申请公布号
US2248748(A)
申请公布日期
1941.07.08
申请号
US19380186156
申请日期
1938.01.21
申请人
SPERRY PRODUCTS, INC.
发明人
DRAPER CHARLES STARK;MCKAY WALTER
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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