000 00273nam a2200121Ia 4500
008 220201s1956 xx 000 0 eng d
082 _a621.384
_bPHI
100 _aPhilips
245 0 _aU H F tubes
260 _aLondon
_bChafman & Hall
_c1956
300 _a60
942 _2ddc
999 _c12177
_d12177