Brielmaier hill mower.
https://www.youtube.com/watch?v=E8FtXSpFT_s
Previously:
https://www.homemadetools.net/forum/...5139#post81241
https://www.homemadetools.net/forum/...2421#post76333
https://www.homemadetools.net/forum/...5899#post82725
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