| 摘要 |
It has a robust structure consisting of a prismatic body of inverted section in the upper part of which are coupled, at the end thereof, pieces which are fixed with screws to central apertures of the upper branch of the U which forms the structure, and which pieces in turn constitute the toe and leg part of the heel, with buckles, whilst, on the sides of the structure, are axles on which are mounted individual end wheels with their bearings. <IMAGE>
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