These printers use the TK-719 cartridge:
Royal-Copystar CS 3050
Royal-Copystar CS 4050
Royal-Copystar CS 5050
Kyocera KM 3050
Kyocera KM 4050
Kyocera KM 5050
Kyocera-Mita KM 3050
Kyocera-Mita KM 4050
Kyocera-Mita KM 5050