000 00270nam a22000977a 4500
082 _a535 INS'T
245 _aINSTALLATION OF OPTICAL PROJECTION EQUIPMENT IN EDCATIONAL ESTABLISHMENT
260 _aLONDON
_bBRITISH STANDARDS INSTITUTE
_c1953
300 _a52P
942 _cBK
999 _c582962
_d582962