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经营范围
发明名称
Variable impulse transmitter
摘要
申请公布号
US2502440(A)
申请公布日期
1950.04.04
申请号
US19470723446
申请日期
1947.01.21
申请人
INTERNATIONAL STANDARD ELECTRIC CORPORATION
发明人
DEAKIN GERALD
分类号
H04M1/23;H04M1/515;H04Q1/34;H04Q3/42
主分类号
H04M1/23
代理机构
代理人
主权项
地址
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