00615nam a22001817a 4500 BD-DhUL 20171221103658.0 171221s1948 xxua|||| f||| 00| 0 eng BD-DhUL BD-DhUL 621.385 ATT Atkinson, J. Telephony : a detailed exposition of the telephone exchange systems of the British post office : vol. 1, general principles and manual exchange systems / J. Atkinson. London : Sir Isaac Pitman, 1948. xii, 514 p. : ill. ; 25 cm. Includes index. Telephony ddc BK 233310 233310 0 0 ddc 0 621_385000000000000_ATT 0 NFIC 359927 DUSL DUSL GEN 1971-09-19 Purchased 621.385 ATT A78758 2017-12-21 8 2017-12-21 BK 0 0 ddc 0 621_385000000000000_ATT 0 NFIC 359932 DUSL DUSL GEN 1971-08-04 Purchased 621.385 ATT A76954 2017-12-21 5 2017-12-21 BK