000 00306nam a2200121Ia 4500
008 220201s9999 xx 000 0 eng d
082 _bUGC
100 _aU G C ( E T & T) Margdarshan, New Delhi
245 0 _aSignals-1
260 _aNew Delhi
_bE.T & T
_cVedio Cassett
300 _a17.25 min
942 _2ddc
999 _c25319
_d25319