000 00281nam a2200121Ia 4500
008 211209s1974 xx 000 0 und d
041 _aeng
082 _a621.388 5 N74 FRA
100 _aFRASER W
245 _aTELECOMMUNICATIONS
260 _bCALICO PUBLISHERS
_c1974
300 _a804
999 _c6906
_d6906