000 00254nam a2200109Ia 4500
008 160710s1954 xx 000 0 und d
100 _aSAY,M.G.
245 _aCATHODE RAY TUBES
260 _aLONDON
_bGEORGE NEWNES
_c1954
300 _a216
942 _2ddc
_cB
999 _c24450
_d24450