User:MichaelFrey/Handcar

https://www.google.ch/search?tbm=pts&hl=de&q=Hand-car#q=Hand-car&hl=de&tbm=pts&tbs=sbdo:1

https://www.google.ch/patents/US843646

there wheel: https://www.google.ch/patents/USRE9571

Monowheel: https://www.google.ch/patents/US225585

ONe-way mechanism: https://www.google.ch/patents/US167119

https://www.google.ch/patents/US182896

toys:
 * https://www.google.ch/patents/US213749

https://www.google.ch/patents/US413742