Tunnel boring machine concrete segment erector.
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Previously:
https://www.homemadetools.net/forum/...841#post100173
https://www.homemadetools.net/forum/...418#post204747
https://www.homemadetools.net/forum/...165#post161143
https://www.homemadetools.net/forum/...165#post153733
https://www.homemadetools.net/forum/...905#post152724
