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those have been around since 1997 or so..i think Texas instruments started those for "INFOCUS"
they spin pretty fast,one of their models you can turn a knob on top of the projector and it actually moves the wheel out of the optical block for super bright image..but of course the pic is in monochrome.
what is neat to do while the unit is on is to rotate the projector by hand.and look at the picture while you are doing this,creates some interesting effects... the gravity effect causes a loss in wheel speed.. or eh..sync..
terry
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