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发明名称
Telephone communicating system
摘要
申请公布号
US2022788(A)
申请公布日期
1935.12.03
申请号
US19330654004
申请日期
1933.01.28
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
SORENSEN ANDREW J.;WHITELOCK LELAND D.
分类号
B61L15/00
主分类号
B61L15/00
代理机构
代理人
主权项
地址
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