The ornamental design for a cold knifeholder, as shown and described.
FIG. 1 is an upper perspective view of a cold knife holder showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a side view thereof;
FIG. 5 is an opposite side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a perspective view thereof, shown in condition of use with a car disclosed in broken lines to illustrate environmental matter.
The knife blade shown in broken lines in FIGS. 1-8 forms no part of the claimed design. The broken lines showing a car in FIG. 8 represents environmental matter and forms no part of the claimed design.