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The ornamental design for a wheelchair propulsion unit, as shown and described. |
FIG. 1 is a right side elevational view of a wheelchair propulsion unit showing my new design, the broken lines are for illustrative purposes only;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is an enlarged top and left side perspective view thereof;
FIG. 6 is an enlarged bottom and left side perspective view thereof; and
FIG. 7 is a bottom plan view thereof.
The portion of the attachment arm in FIGS. 2, 3, 5 and 6 is shown broken for convenience of illustration.
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