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	1.	Image from Google Jackets Image from OpenLibrary	Telecommunication Switch by "Viswanathan, Thiagarajan" Material type: Text; Format: print ; Literary form: Not fiction Publication details: New Delhi ; P.H.I ; 1997 Availability: Items available for loan: IET Lucknow Central Library (1).
	2.	Image from Amazon.com Image from Google Jackets Image from OpenLibrary	TELECOMMUNICATION SWITCHING SYSTEMS AND NETWORKS by "VISWANATHAN, THIAGARAJAN...." Edition: 2 Publication details: PHI LEARNING Availability: Items available for loan: IET Lucknow Central Library (10)Call number: 621.38216 VIS, ...

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