00530nam a22001457a 4500 0 0 0 0 RIU RIU 2012-08-06 Purchased: Progressive International 212.00 0 621.385 JOL 1195 2012-08-06 00:00:00 1 2019-02-21 BK 3488 3488 8185614369 (hb) 621.385 JOL Jolley , E. H. Introduction to telephony and telegraphy Allahabad Wheeler Publishing 1994 x, 413 p. : ill. ; 23 cm. Includes index. Telephone Telephone services Electric telegraph Circuit components Telephone instruments Switching systems Transmission methods Telegraph FEAS BK