Anti-kickback rollers on WoodWorks

The anti-kickback rollers David Marks uses on WoodWorks look to be industrial-strength... Does anyone recognize the brand & model? And do they work well?
Thanks, Heath
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Try
http://woodworker.com/cgi-bin/fullpres.exe?PARTNUM 974&LARGEVIEW=ON&Last Cookie 0201114004317
I have not used them so I have no idea if they work well. (The other)Mike G.
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