These printers use the 28P2420 cartridge:

IBM 4516

IBM Infoprint 1116

IBM Infoprint 4516

Burroughs-Unisys UDS-123

Lexmark 323 N

Lexmark E 321

Lexmark E 323

Lexmark E 323 N

Lexmark E 323 T

Source-Technologies ST 1116