The ornamental design for a mannequin and supportbasecombination, as shown and described.
FIG. 1 is a front perspective view of a mannequin and support base combination showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof; and,
FIG. 6 is a top view thereof.
A bottom view of the mannequin and support base combination includes only unclaimed surfaces and is, therefore, omitted.
The features shown in broken lines are portions of the mannequin and support base combination and environmental subject matter to the mannequin and support base combination forming no part of the claimed design. The features shown in long dash-short dash bolded broken lines indicate the bounds of the claimed design and otherwise form no part of the claimed design.