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发明名称
Beacon system
摘要
申请公布号
US2441877(A)
申请公布日期
1948.05.18
申请号
US19430489657
申请日期
1943.06.04
申请人
FLETT WILLIAM J
发明人
FLETT WILLIAM J.
分类号
B64F1/20;G01S1/02;G01S19/11;G01S19/48
主分类号
B64F1/20
代理机构
代理人
主权项
地址
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