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经营范围
发明名称
POLARIZED D.C. SIGNALING SYSTEM AND MEANS FOR SUPERVISING SAME
摘要
申请公布号
US3448447(A)
申请公布日期
1969.06.03
申请号
USD3448447
申请日期
1965.06.28
申请人
NOTIFIER CO.
发明人
CLAUDE L. TETHEROW
分类号
G08B27/00;(IPC1-7):G08B29/00;G08B23/00
主分类号
G08B27/00
代理机构
代理人
主权项
地址
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