Remote-controlled snow chains by Czech inventor Petr Gross.
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Previously:
https://www.homemadetools.net/forum/...120#post130222
https://www.homemadetools.net/forum/...492#post127847
https://www.homemadetools.net/forum/...984#post129686
https://www.homemadetools.net/forum/...711#post123839
https://www.homemadetools.net/forum/...162#post126157