000 00247nam a2200097Ia 4500
008 190719s9999 xx 000 0 und d
100 _aS.K.Gupta & Others
245 0 _aMachanics &Electronic Devices
260 _aN.D
_bR.Chand
_c2018
942 _cBK
999 _c15711
_d15711