000 00305nam a2200121 4500
027 _aSTD 4846 : October 1972
_q1972
041 _aeng
942 _cSD
110 _aBRITISH STANDARDS INSTITUTION
245 _aBS 4846 : October 1972
260 _aLondon
_bBRITISH STANDARDS INSTITUTION
500 _aSTD1663
999 _c176087
_d176087