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经营范围
发明名称
Timing device for controlling telephone or other circuits
摘要
申请公布号
US1921733(A)
申请公布日期
1933.08.08
申请号
US19310524362
申请日期
1931.03.21
申请人
WILLIAM H. GRUND;EDWARD H. SPINDLER
发明人
CONNELL SIDNEY
分类号
H04M17/02
主分类号
H04M17/02
代理机构
代理人
主权项
地址
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