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发明名称
Impulse sender for use in automatic telephone systems and the like
摘要
申请公布号
US1862601(A)
申请公布日期
1932.06.14
申请号
US19310522060
申请日期
1931.03.12
申请人
DONALD MACADIE
发明人
MACADIE DONALD
分类号
H04M1/272
主分类号
H04M1/272
代理机构
代理人
主权项
地址
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