Hobbs, Marvin. creator Blue Ridge Summit, Pa Tab Books 1981 1st ed. 308 p. : ill. ; 22 cm. The Slow Push for Progress (Page-7) Basic Switching and Traffic Concepts (Page-19) Logic Switching Algebra and Control (Page-39) Circuit Switches and Relays for Speech (Page-56) Control and Signal Methods (Page-78) Modern Step-by-Step and Rotary Exchanges (Page-104) Electromechanical Crossbar Systems (Page-128) Electronic Exchanges with Wired Logic (Page-142) The Elements of Stored Program Control (Page-162) Typical SPC Exchange Switching Systems (Page-199) Data and Telex Switching (Page-215) Automatic Private Branch Exchanges (Page-229). by Marvin Hobbs. Includes index. Almirah No.36 Shelf No.5 Telecommunications engineering 621.382 0830612785 (pbk.) : 0830696350 : 80028236 20170207153244.0