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Three sitting boards, instead of two as found on a normal seesaw. It's mounted on a ball joint in the center with a set of stops to prevent too much rotation (a few degrees is fine, but you don't want the little tykes coming down and sideways and blowing out their knees).
Fun for more of the whole
family than previous iterations.
Not what I've seen, but you could also use this technology for your three-way. [DrCurry, Oct 06 2006]
Blazer 3-Way Seesaw
This is a .pdf file, and you will probably want to rotate the image 90 degrees counterclockwise to properly appreciate it. [jurist, Oct 06 2006]
||I would call this a three-saw
||I seem to recall seeing a bowl-like device that functioned as a four-way seesaw.