00762nam a2200253 a 4500 3409693 BD-DhUL 20170419100934.0 891229s1988 enka 001 0 bg 89220296 0946027781 DLC BD-DhUL BD-DhUL TK5101 .D48 1988 001.51 20 WOR world communications / London]: Grosvenor Press International, [988 . 400 p. : ill. (some col.) ; 25 cm. Telecommunication systems. Telecommunication. Grosvenor Press International. 7 cbc orignew 3 ncip 19 y-gencatlg ddc REF ep25 12-29-89; ea12 01-04-90; fg11 1-17-90 187662 187662 0 0 ddc 0 001_510000000000000_WOR 1 REF 323895 DUL DUL ASC 2017-04-19 Gift 001.51 WOR 365054 2017-04-19 2017-04-19 REF