000 00311nam a2200109Ia 4500
001 31560
008 170722s9999 xx 000 0 und d
245 _aMechanical services The modern flat Units 21 and 22 /
260 _bOpen University Press ,
_c1975.
300 _a78and32pages of plates
_c29.5cms
942 _cGEN
999 _c94767
_d94767