00263nam a2200109Ia 4500008004100000041000800041082002200049100001500071245002700086260003200113300000800145211209s1954    xx            000 0 und d  aeng  a621.8 N54 VEN/WAL  aVENTON L D  aELEMENTS OF MECHANISM   aNEW DELHIbJOHN WILEYc1954  a494