00282nam a2200109Ia 450000500170000000800410001708200140005810000170007224500280008926000470011730000080016420260225044816.0260224s9999||||xx |||||||||||||| ||und||  a621.9 BEV  aThomas Bevan 4aThe theory of machines   aIslamabad: National Book Foundation c1988  a621