The ornamental design for an attachment for tabletcomputer, as shown and described.
FIG. 1 is a front perspective view of an attachment for tablet computer showing my new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines in FIGS. 1-8 depict portions of the attachment for tablet computer that form no part of the claimed design. The dot-dash broken lines represent the boundaries of the claim and form no part of the claimed design.