Swivel chair base

USD1123476SActive Publication Date: 2026-04-28LIN FUGUANG

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[0001] FIG. 1 is a back, left, top perspective view of a swivel chair base showing my new design;

[0002] FIG. 2 is a front view thereof;

[0003] FIG. 3 is a back view thereof;

[0004] FIG. 4 is a left view thereof;

[0005] FIG. 5 is a right view thereof;

[0006] FIG. 6 is a top view thereof; and,

[0007] FIG. 7 is a bottom view thereof.

[0008] The broken lines shown on the drawings depict portions of the swivel chair base that form no part of the claimed design.

The ornamental design for a swivel chair base, as shown and described.