Power Nozzle Brush Selector (6-76)
Found a chart before the first upright.It shows that both PN-1 & 2 had 2 row domestic brush,3 row commercial and 2 row soft brush available.(the 3 row above is service no 10368)The PN-4 had 2 row domestic,comm agitator brush
& 2 row soft brush available.(Similar brushes were continued on first UR)
Agitator/bristle was recommended for indoor/outdoor type.Soft for delicate.And for 'splush' there was the agitator/bristle and spacers(under bottom plate)for PN-4 and later UR.
Also noticed a folder for CB with PN-2 in same both that shows nozzle with 2 row brush and announces they there are now 'NEW' paper filters available for CB.