00524nam 2202657 45000010005000000030023000050050009000280080041000370820008000780720038000860200018001241000010001422600024001522450044001766500038002206500026002586500022002846500026003062657StarLibrary Marc Built20180420201711 ||||| |||||||||||amh  a621 athe history of telecommunications a0-07-213188-8 aregis bMC GRAW,HILL c2001 aVoice and data communications hand book athe history of telecommunications athe telephone network athe telephone set avoice characteristics