FIG. 1 is a perspective view of an attachment device showing the design;
FIG. 2 is a left side elevational view of the attachment device of FIG. 1;
FIG. 3 is a right side elevational view of the attachment device of FIG. 1;
FIG. 4 is a top plan view of the attachment device of FIG. 1;
FIG. 5 is a bottom plan view of the attachment device of FIG. 1;
FIG. 6 is a back elevational view of the attachment device of FIG. 1; and,
FIG. 7 is a front elevational view of the attachment device of FIG. 1.
The dash-dash broken lines showing environment in the drawings are included for illustrative purposes only and form no part of the claimed design. The dot-dash-dot broken lines shown in the drawings define the boundaries of the claim and form no part thereof.