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发明名称
Directional system
摘要
申请公布号
US2481509(A)
申请公布日期
1949.09.13
申请号
US19450614587
申请日期
1945.09.05
申请人
HANSEL PAUL G
发明人
HANSEL PAUL G.
分类号
G01S3/54
主分类号
G01S3/54
代理机构
代理人
主权项
地址
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