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发明名称
Indicating and recording system
摘要
申请公布号
US1823091(A)
申请公布日期
1931.09.15
申请号
US19290397226
申请日期
1929.10.04
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
DAHL JACK F.;DAVIS RICHARD C.
分类号
H04M3/523
主分类号
H04M3/523
代理机构
代理人
主权项
地址
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