These printers use the PR4 cartridge:
Click On a Printer to View it's Cartridges


          Olivetti PR 4
          Olivetti PR 4 DR
          Olivetti PR 4 DT
          Olivetti PR 4 RT
          Olivetti PR 4 RTC
          Olivetti PR 4 SL
          Olivetti PR 4 SR
          Craden DP 8