How cow milking machines work.
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Previously:
https://www.homemadetools.net/forum/...226#post165477
https://www.homemadetools.net/forum/...280#post121662
https://www.homemadetools.net/forum/...502#post162341
https://www.homemadetools.net/forum/...911#post156574
https://www.homemadetools.net/forum/...7366#post85606
