These printers use the S2522 cartridge:
Click On a Printer to View it's Cartridges
          NEC NEFAX 635
          NEC NEFAX 637
          NEC NEFAX 645
          NEC NEFAX 647
          Sharp FO 550
          Sharp FO 4650
          Sharp FO 4700
          Sharp FO 4970
          Sharp FO 5550
          Sharp FO 5700
          Sharp FO 5800
          Sharp FO 6700