00277nam a2200109Ia 4500 231212s1968 xx 000 0 und d eng 621.3841 Jolley E.H. Introduction To Telephony Allahabad International Book 1968 959043 959043 0 0 0 0 ITM ITM 2023-12-13 60.00 0 621.3841 ITM-P-1895 2023-12-13 00:00:00 2023-12-13 BK