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发明名称
Machine ringing system
摘要
申请公布号
US2246576(A)
申请公布日期
1941.06.24
申请号
US19390306062
申请日期
1939.11.25
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
DARROW WIRT E.;PETERSON GEORGE H.;YOST LLOYD A.
分类号
H04M19/02
主分类号
H04M19/02
代理机构
代理人
主权项
地址
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