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.

[IMGHTTPDEAD]http://www.xs4all.nl/~loosen/beamer/lens2_t.jpg[/IMGHTTPDEAD]

[IMGHTTPDEAD]http://www.xs4all.nl/~loosen/beamer/lens4_t.jpg[/IMGHTTPDEAD]

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?