The ornamental design for a controlmechanismblockingguard, as shown and described.
FIG. 1 is a top plan view of a control mechanism blocking guard showing my new design;
FIG. 2 is a front elevational view of the design of FIG. 1;
FIG. 3 is a left side elevational view of the design of FIG. 4,
FIG. 4 is a bottom plan view of the design of FIG. 1;
FIG. 5 is a right side elevational view of the design of FIG. 4;
FIG. 6 is a rear elevational view of the design of FIG. 1;
FIG. 7 is a top front environmental view of the design of FIG. 1; and,
FIG. 8 is a bottom environmental view of the design of FIG. 1.
Applicant does not claim the apertures shown in broken lines in FIGS. 1, 4, and 8. The attachment features shown in broken lines and the portions of the vehicle shown in broken lines form no part of the claimed design. Portions shown in broken lines are for illustrative purposes only and form no part of the claimed design.