The ornamental design for a liftingjack, as shown and described.
FIG. 1 is a front and side perspective view of a lifting jack showing my
new design;
FIG. 2 is a top, rear and side perspective view thereof;
FIG. 3 is a side elevational view thereof, the opposite side elevational
view being a mirror image of that shown;
FIG. 4 is an exploded front perspective view of the lifting assembly. The
reaming portion of the lifting jack being omitted for convenience of
illustration; and,