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发明名称
Method of and apparatus for giving audible time signals
摘要
申请公布号
US1936700(A)
申请公布日期
1933.11.28
申请号
US19320604499
申请日期
1932.04.11
申请人
WELLS JOHN W
发明人
WELLS JOHN W.
分类号
H04M3/487
主分类号
H04M3/487
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代理人
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