The ornamental design for a washbasinmixer, as shown and described.
FIG. 1 is a left side elevational view of a wash basin mixer according to the present invention.
FIG. 2 is a right side elevational view of the wash basin mixer of FIG. 1.
FIG. 3 is a top plan view of the wash basin mixer of FIG. 1.
FIG. 4 is a bottom plan view of the wash basin mixer of FIG. 1.
FIG. 5 is a front elevational view of the wash basin mixer of FIG. 1.
FIG. 6 is a rear elevational view of the wash basin mixer of FIG. 1; and,
FIG. 7 is a three quarter view of the wash basin mixer of FIG. 1.
The dashed lines illustrate environment that does not form a part of the present invention, and no claim is made to the material illustrated with dashed lines.