Rank Xerox Lens

Recenty I bought 2 big lenses of a second hand trading site, they seem to be pretty good at projecting (tested with my digicam lcd).
However I can't find any information on the net about them, I would like to know if it's a double or triple lense and if they are suitable for 15 inch tft projection.



One of them has some little scratches on one side in the middle but I don't think that matters alot.

Does anyone have any information about these lenses?