00529 a2200181 4500 068543 OSt 20220218174013.0 302.2 C73C Communication through the ages edited by Lakhan Mehrotra and Raghavendra Vajpeyi New Delhi Aryan Book 2009 165p. Telecommunication; Signals and signaling Mehrotra, Lakhan Editor Vajpeyi, Raghavendra Editor ddc BK 2199 2199 0 0 ddc 0 0 TXB CURAJ CURAJ 2012-03-07 ENG 495.00 0 302.2 C73C 2830 2024-11-21 2020-09-02 BK