FIG. 1 is a perspective view of a handle attachment of case for electronic device according to a first embodiment of the new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is another perspective view thereof, shown in an open position;
FIG. 9 is another perspective view thereof, shown in an alternative position of use;
FIG. 10 is a perspective view of a case for electronic device according to a second embodiment of the new design;
FIG. 11 is a front view thereof;
FIG. 12 is a rear view thereof;
FIG. 13 is a left side view thereof;
FIG. 14 is a right side view thereof;
FIG. 15 is a top plan view thereof;
FIG. 16 is a bottom plan view thereof;
FIG. 17 is another perspective view thereof, shown in an open position;
FIG. 18 is another perspective view thereof, shown in an alternative position of use;
FIG. 19 is a perspective view of a handle attachment of case for electronic device according to a third embodiment of the new design;
FIG. 20 is a front view thereof;
FIG. 21 is a rear view thereof;
FIG. 22 is a left side view thereof;
FIG. 23 is a right side view thereof;
FIG. 24 is a top plan view thereof;
FIG. 25 is a bottom plan view thereof;
FIG. 26 is another perspective view thereof, shown in an open position;
FIG. 27 is another perspective view thereof, shown in an alternative position of use;
FIG. 28 is a perspective view of a handle attachment of case for electronic device according to a fourth embodiment of the new design;
FIG. 29 is a front view thereof;
FIG. 30 is a rear view thereof;
FIG. 31 is a left side view thereof;
FIG. 32 is a right side view thereof;
FIG. 33 is a top plan view thereof;
FIG. 34 is a bottom plan view thereof;
FIG. 35 is another perspective view thereof, shown in an open position;
FIG. 36 is another perspective view thereof, shown in an alternative position of use;
FIG. 37 is a perspective view of a fifth embodiment showing my new design;
FIG. 38 is a front view thereof;
FIG. 39 is a rear view thereof;
FIG. 40 is a left side view thereof;
FIG. 41 is a right side view thereof;
FIG. 42 is a top plan view thereof;
FIG. 43 is bottom plan view thereof;
FIG. 44 is another perspective view thereof, shown in an open position; and,
FIG. 45 is another perspective, environmental view thereof.
The broken lines in the Figures show unclaimed subject matter only and form no part of the claimed design.