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The ornamental design for a modular spiral staircase, as shown and described. |
FIG. 1 is a front elevational view of the step unit for a modular spiral staircase of the present invention;
FIG. 2 is a back elevational view of the step unit for a modular spiral staircase of FIG. 1;
FIG. 3 is a left side elevational view of the step unit for a modular spiral staircase of FIG. 1;
FIG. 4 is a right side elevational view of the step unit for a modular spiral staircase of FIG. 1;
FIG. 5 is a top plan view of the step unit for a modular spiral staircase of FIG. 1;
FIG. 6 is a bottom plan view of the step unit for a modular spiral staircase of FIG. 1; and,
FIG. 7 is a front elevational in use view of the step unit for a modular spiral staircase of FIG. 1.
The broken lines disclosing a spiral staircase is for illustrative purposes only, and forms no part of the claimed design.
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