涉及以下类型的混凝土搅拌机:（a）自由式（滚筒式）和强制式（盘式或槽式）间歇式搅拌机；（b）固定斜轴转鼓类卡车式搅拌机和用作搅拌器的卡车式搅拌机。不包括专门为混合零坍落度混凝土而设计的搅拌机，如混凝土砌块厂使用的搅拌机。

Deals with concrete mixers of the following types: (a) free-full (drum) and forced action (pan or trough) batch mixers; and (b) truck type mixers of the fixed inclined axis revolving drum category and truck mixers used as agitators. Does not cover mixers specifically designed for mixing zero slump concrete such as those used in concrete block plants.