The ornamental design for a blank for a threecompartment box, substantially as shown and described.
FIG. 1 is a top plan view of a blank for a three compartment box embodying
my new design, the bottom plan view being the same in appearance;
FIG. 2 is a front elevational edge view of my new design, the rear
elevational edge view being the same in appearance; and
FIG. 3 is a right end elevational edge view of my new design, the left end
elevational edge view being the same in appearance.
The blank is of conventional thickness. The dash lines formed of dashes of
uniform length represent fold lines which are also perforated, while the
dash lines formed of long and short dashes represent fold lines without
perforations.