000 00304nam a2200121Ia 4500
008 220201s1972 xx 000 0 eng d
041 _aENG
100 _aLYTHALL, R T
245 0 _aJ AND P SWITCHGEAR BOOK
260 _aLONDON
_bTHAMES AND HUDSON PUBLISHING COMPANY
_c1972
300 _a800
942 _2ddc
999 _c45839
_d45839