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发明名称
Telephone substation apparatus
摘要
申请公布号
US2544325(A)
申请公布日期
1951.03.06
申请号
US19470764614
申请日期
1947.07.30
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
JR. CHARLES A. JOHNSON,;KRUMREICH CHARLES L.
分类号
H04M1/02
主分类号
H04M1/02
代理机构
代理人
主权项
地址
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