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发明名称
Distress signal for electricallyoperated clocks
摘要
申请公布号
US2081450(A)
申请公布日期
1937.05.25
申请号
US19340759504
申请日期
1934.12.28
申请人
ELLIOT WILLIAM P
发明人
ELLIOT WILLIAM P.
分类号
G04B19/30;G04C15/00
主分类号
G04B19/30
代理机构
代理人
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