Illustrations used here are not intended to include all existing industrial or agricultural machines, or to be exactly descriptive of any particular machine. They have been picked to describe the principles to be used in applying this standard. PurposeâThis Standard provides names of many of the major components and parts peculiar to agricultural and industrial rotary, flail and sickle bar type mowers. NOTEâWhere two part names are shown separated by a slash, the first name is the preferred terminology.