公开(公告)号：US3576402A

公开(公告)日：1971-04-27

申请号：US3576402D

申请日：1968-03-13

Applicant: BELL TELEPHONE LABOR INC

Inventor： BAKER GERALD P ,  EDINGTON JOHN E ,  ROBERTSON RALSTON H JR

IPC: H04M17/02 ,  H04W88/02 ,  H04M5/00

CPC classification number: H04W88/02 ,  H04M17/023

Abstract: In a coin telephone set adapted for use in a mobile radio telephone system that provides phone service on trains, for example, signaling reliability is enhanced by the employment of means including a timing circuit for ensuring the transmission of multifrequency dial signals of limited duration irrespective of the duration of the manual actuation of the dial.