The ornamental design for an attachment apparatus for an electronic device, as shown and described.
FIG. 1 is a front, top, left perspective view of an attachment apparatus for an electronic device in accordance with the present invention;
FIG. 2 is a rear, bottom, right perspective view of the attachment apparatus of FIG. 1;
FIG. 3 is a front elevation view of the attachment apparatus of FIG. 1;
FIG. 4 is a rear elevation view of the attachment apparatus of FIG. 1;
FIG. 5 is a right elevation view of the attachment apparatus of FIG. 1;
FIG. 6 is a left elevation view of the attachment apparatus of FIG. 1;
FIG. 7 is a top plan view of the attachment apparatus of FIG. 1; and,
FIG. 8 is a bottom plan view of the attachment apparatus of FIG. 1.
The broken lines form no part of the claimed design. A broken line encompassing an unshaded area identifies an area that forms no part of the claimed design. A broken line having alternating short and long dashes represents bounds of the claimed design.