Funny what all you find when you clean.  I'm not even sure if these cartridges go to a fax or a printer (it's been a long time since I've cleaned this closet).  Info:  Brother PC-401          in smaller letters it says "for use with Fax-560, Fax-580MC, Fax-565, and MFC-660MC  I have 2 of them.  Free to the first taker.  Lois Hartman Watervliet District Library