01065 a2200181 4500 Nust 20221227122156.0 Nust 621.385,HER Herbert , Procter 106027 Telephony : A Detailed Exposition of the Telephone System of the British post Office / Procter Herbert , Vol II london Sir Isaac Pitman 1940 749p; Introduction (Page-1), Elementary Principles of the Step-by-step System (Page-11), Subscribers Station Apparatus (Page-36), Relays and Mechanisms (Page-85), Power Plant and Common Apparatus (Page-170), Non – Director System (Page-202), Multi – Exchange Areas (page-280), Director System (Page-303), Miscellaneous Circuits (Page-443), Siemens no 16 System (Page-476), Relay System (page-519), Unit Automatic Exchanges (Page-547), Revertive Impulse Systems (Page-583), Recent Developments in Swathing Systems (Page-612), Trunking and Grading (Page-560), Maintence (Page-684). Telephony 106028 ddc BK 195020 195020 0 0 ddc 0 0 MCS MCS GEN 2016-12-12 621.385,HER MCS6855 2016-12-08 2016-12-12 BK Almirah No.40, Shelf No.2