000			00623nam a2200241Ia 4500
001			1062
005			20250221124405.0
008			250214s9999||||xx |||||||||||||| ||und||
020			_a8185614369
100			_aJolley, E H
245		0	_aIntroduction to telephony and telegraphy
260			_aAllahabad
260			_bWheeler
260			_c1992
300			_ax, 413p.
500			_aIncludes index
650			_aDigital telephone signalling
650			_aTelegraphy
650			_aTelephone signalling codes -- Digital
650			_aTelephony
650			_aTraffic and Trunking -- Telephone traffic
942			_cBK
999			_c17253 _d17253