00374nam a2200145Ia 4500008004100000084001400041100002100055245004000076250002000116260001800136260000900154260002100163300000900184500003500193180424s9999    xx            000 0 und d  a621.38 H3  a"Hardy, James K" 0aElectronic Communication Technology  a\\198600ENGGPSX  aPrentice Hall  b1986  cEnglewood Cliffs  a420p  aincludes index and biblioraphy