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发明名称
Telephone dial testing by means of an oscilloscope pattern
摘要
申请公布号
US2535118(A)
申请公布日期
1950.12.26
申请号
US19470728464
申请日期
1947.02.14
申请人
THE NORTH ELECTRIC MANUFACTURING COMPANY
发明人
BLASHFIELD WILLIAM H.
分类号
H04M1/24
主分类号
H04M1/24
代理机构
代理人
主权项
地址
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