00813nam a2200205 i 45000010008000000030008000080050017000160080041000330220014000740400021000880820017001091000017001262450219001432600034003623000031003963650014004275040053004415050089004946500024005832240547BD-DhUL20150114171638.0811020m19481950uk a     b    00000 eng d  a273431803  aBD-DhULcBD-DhUL  a621.385bATT10aAtkinson, J.10aTelephoney :ba detailed exposition of the telephone exchange system of the British Post Office : vol. I, general principles and manual exchange systems.cJ. Atkinson.[ A new edition of Telephony harbert & procter]0 aLondon :bPitman,c1948-1950.  axii, p.  :bill. ;c25 cm.  aGBPb2.15  aIncludes bibliographical references and indexes.0 av. 1 General principles and manual exchange systems; v.2 Automatic exchange systems. 0aTelephone stations.