1920s roller skates. Your browser does not support the video tag. Previously: 1906 pedaled roller skates - photo and patent Printing logos on skateboard wheels - GIF Wheeled knee pads and patent searching - GIF, video, photos, patents Water jet vs. skateboard wheel - GIF
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And then you can make a trip to the orthopedic surgeon...
I did notice that the foot was well below the axle, so there is some stability there.
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