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1.发明授权Electric pulse signalling system having switching means connected to a constant-voltage source 失效具有连接到恒压源的开关装置的电脉冲信号系统
公开(公告)号：US3234514A
公开(公告)日：1966-02-08
申请号：US85814359
申请日：1959-12-08
Applicant: INT STANDARD ELECTRIC CORP
Inventor： JENNINGS WARD HUGH , MARK BUNDY ERNEST
IPC: H04Q9/00
CPC classification number: H04Q9/00
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