00340nam a22001217a 4500 0-273-43181-1 621.385 ATK'T AKKINSON, J 77267 TELEPHONY A DETAILED EXPOSITION OF THE TELEPHONE EXCHANGE SYSTEMS OF THE BRITISH POST OFFICE VOL-II LONDON PITMAN 1990 BK 582568 582568 0 0 0 0 CEME CEME GEN 2017-06-06 0 621.385 ATK'T CEME-9878 2021-06-28 2021-06-28 BK