The ornamental design for a selfmatingbeam, as shown and described.
FIG. 1 is a top perspective view of the design of a self mating beam;
FIG. 2 is a top plan view of the self mating beam shown in FIG. 1;
FIG. 3 is a bottom plan view of the self mating beam shown in FIG. 1;
FIG. 4 is a right side view of the self mating beam shown in FIG. 1;
FIG. 5 is a left side view of the self mating beam shown in FIG. 1;
FIG. 6 is a front side view of the self mating beam shown in FIG. 1;
FIG. 7 is a back side view of the self mating beam shown in FIG. 1; and,
FIG. 8 is a top perspective view thereof, showing the self mating beam shown in FIG. 1 in an environment of use.
The broken lines in FIG. 8 illustrate environmental subject matter only and form no part of the claimed design.
The self mating beam is shown with a symbolic break in its length. The appearance of any portion of the self mating beam between the break lines forms no part of the claimed design.