The ornamental design for a fingerrestrainingdevice for a keyboard, as shown and described.
FIG. 1 is a perspective view of a finger restraining device for a keyboard showing my new design;
FIG. 2 is a right side elevational view thereof, taken in the direction of arrow 2 in FIG. 8;
FIG. 3 is a first end elevational view thereof, taken in the direction of arrow 3 in FIG. 8;
FIG. 4 is a left side elevational view thereof, taken in the direction of arrow 2 in FIG. 8;
FIG. 5 is a second end elevational view thereof, taken in the direction of arrow 5 in FIG. 8;
FIG. 6 is a top plan view thereof, taken in the direction of arrow 6 in FIG. 8;
FIG. 7 is a bottom plan view thereof, taken in the direction of arrow 7 in FIG. 8; and,
FIG. 8 is a view identical to FIG. 1 with descriptive legend directional arrows included which are necessary for better understanding of the drawing in accordance with 37 CFR 1.84 and appropriate with good engineering practices, so as to best indicate in what directions previous views are taken so that nothing regarding the design sought to be patented is ambiguous or left to conjecture.