Spiral staircase

The ornamental design for spiral staircase, substantially as shown.

FIG. 1 is a perspective view of a spiral staircase, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a greatly enlarged view thereof;

FIG. 4 is a greatly enlarged top plan view of one of the steps thereof; and

FIG. 5 is a greatly enlarged bottom plan view of one of the steps thereof.

Patent	Priority	Assignee	Title
4831706,	Mar 21 1988	FLOOR TO FLOOR, INC	Method of making spiral staircases
5737884,	Sep 17 1996		Spiral stair case
D363096,	Sep 29 1994	LEGO A S	Staircase for a toy building set

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