How are jigsaw puzzles mass produced

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Found this.
http://www.ahs.uwaterloo.ca/~museum/puzzles/jigsaw/jigsaw3.html
(note to self: stop fannying about with this and do some work!!!! :-) )
-- Richard Sampson
email me at richard at olifant d-ot co do-t uk
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As others have said cardboard jigsaws puzzles are stamped out. You can actually see this by looking at the pieces the picture side tends to have a slight rounding off on the edge of the cut and the lower edge is pushed down slightly.
However for plywood puzzles they are often cut using a saw and to do this, several puzzles are stacked on top of each other, to minimise the cutting time.
--
Mathematicians, please don't drink and derive.

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