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经营范围
发明名称
Impulse transmitter
摘要
申请公布号
US2416692(A)
申请公布日期
1947.03.04
申请号
US19450615539
申请日期
1945.09.11
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HERSEY RALPH E.
分类号
H04M1/56
主分类号
H04M1/56
代理机构
代理人
主权项
地址
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