The book, continuing the Encyclopedia of Repair series, describes about four hundred microcircuits used in modern imported telephone and communication equipment. The directory includes products from AMI, Ericsson, GEC Plessey, Exar, Harris, NMS, Motorola, Mostek, Mitel, National Semiconductor, Panasonic, Philips, "Rohm," "Samsung," "Sanyo," "Sharp," "SGS-Thomson," "Siemens," "Silicon Systems," "Telefunken," "Temic," "UMC," "Winbond."