The ornamental design for a glassplateadapter, substantially as shown and described.
FIG. 1 is a top isometric view of a glass plate adapter, showing my new design.
FIG. 2 is a bottom isometric view thereof.
FIG. 3 is a front elevational view thereof.
FIG. 4 is a back elevational view thereof.
FIG. 5 is a left elevational view thereof.
FIG. 6 is a right elevational view thereof.
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
Stippling and tangent lines shown in the drawings are intended to represent the approximate three-dimensional contour of the design, and are not intended to indicate surface decoration. The broken lines in the drawings illustrate portions of the glass plate adapter and form no part of the claimed design.