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The ornamental design for a knee platform crutch, substantially as shown. |
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FIG. 1 is a perspective view of a knee platform crutch showing my new design.
FIG. 2 is a side elevational view thereof.
FIG. 3 is a front elevational view thereof.
FIG. 4 is a top plan view thereof.
FIG. 5 is a bottom plan view thereof.
FIG. 6 is a rear elevational view thereof.
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