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999 _c64822
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008 201208b ||||| |||| 00| 0 eng d
082 _a621 S617T
100 _aSinha, Umesh
245 _aTelephony
260 _aNew Delhi
_bSatya Prakashan
_c1999
300 _ap.204
650 _aTelephony
650 _aTelephone Relays
942 _cSW