000 00247nam a2200097Ia 4500
008 160710s1957 xx 000 0 und d
100 _aELECTRONICS WORLD
245 _aELECTRICAL WORLD,MARCH,NO.9-11
260 _bMC GRAW-HILL
_c1957
942 _2ddc
_cB
999 _c40691
_d40691