These printers use the 20-100 cartridge:
Click On a Printer to View it's Cartridges
          NEC Superscript 1260
          NEC Superscript 1260 N
          GCC Elite 12-1200
          GCC Elite 1212
          IBM 4312 Network Printer
          IBM DocuPrint P-12
          IBM Network Printer 12
          IBM Network Printer 4312
          IBM NP 12 Network PTR 12
          IBM Superscript 1260
          IBM Superscript 1260 N
          Lexmark 4312
          Lexmark Network Printer 12