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I claim the ornamental design for a chair having an adjustable height, as shown and described.
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FIG. 1 is a perspective view of a chair having an adjustable height showing my new design in a lowered position;
FIG. 2 is a right side elevational view of FIG. 1;
FIG. 3 is a rear elevational view of FIG. 1;
FIG. 4 is a left side elevational view of FIG. 1;
FIG. 5 is a front elevational view of FIG. 1;
FIG. 6 is a top plan view of FIG. 1;
FIG. 7 is a bottom plan view of FIG. 1;
FIG. 8 is a perspective view of a chair having an adjustable height showing my new design in a raised position;
FIG. 9 is a right side elevational view of FIG. 8;
FIG. 10 is a rear elevational view FIG. 8;
FIG. 11 is a left side elevational view FIG. 8;
FIG. 12 is a front elevational view FIG. 8;
FIG. 13 is a top plan view FIG. 8; and,
FIG. 14 is a bottom plan view FIG. 8.
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