000 00308nam a2200121Ia 4500
008 220201s1963 xx 000 0 eng d
082 _a621.3
100 _aRoyal Air office
245 0 _aRadio engineering trade group
260 _bLondon:Her Mejesty Stationary office
_c1963
300 _a197
942 _2ddc
999 _c75555
_d75555