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发明名称
APPARATUS AND METHOD FOR DIRECTING A BEACON TOWARD A LIMITED VIEWING AREA
摘要
申请公布号
US3457400(A)
申请公布日期
1969.07.22
申请号
USD3457400
申请日期
1966.08.10
申请人
发明人
分类号
G09F13/04;B64F1/06;F21S2/00;F21S8/00;G08B5/00;(IPC1-7):F21M7/00;F21M13/00;F21V13/04
主分类号
G09F13/04
代理机构
代理人
主权项
地址
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