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The ornamental design for a chair base, as shown and described. |
FIG. 1 is a left front perspective view of a chair base showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a right side elevational view thereof, the left side elevational view being the mirror image thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a left, front perspective view of a chair base showing a modification of my new design;
FIG. 8 is a top plan view of the chair base of FIG. 7;
FIG. 9 is a front elevational view thereof;
FIG. 10 is a right side elevational view thereof, the left side elevational view being the mirror image thereof;
FIG. 11 is a rear elevational view thereof; and
FIG. 12 is a bottom plan view thereof.
The broken line showing of a seat member in FIGS. 1 and 7 is for illustrative purposes only and forms no part of the claimed design.
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