American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 427
s some difficulty wasexperienced in working the system on more than one parallel wire. All of thecircuits on which this system was operated have been abandoned and the quadruplexsystem substituted therefor. CHAPTER XXIII. Time Telegraph Service. The Time Telegraph which is in quite extensive use in… … to 7}>rrceCuOulj^
Telegraph
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