These printers use the IR-91B cartridge:
Citizen CBM-910
Citizen CBM-911
Citizen CBM-920
Citizen iDP-3110
Citizen iDP-3111
Citizen MD-910
Citizen MD-911
Casio CE 280
Casio CE 285
Casio CE 300
Casio TK 800
Casio 298
Casio 298 SR
Konic-Electronics SR-508
Konic-Electronics SR-514
Nikkam 4009
Nikkam 4010
Nikkam YK 2808
Nikkam YK 4100
Nurit 2060
Nurit 2070
Olivetti OL 2000
Olivetti OL 2001
Olivetti OL 2002
Olivetti OL 2003
Olivetti OL 2004
Olivetti OL 2005
Olivetti OL 2508
Olivetti OL 3508
Olivetti OL 3608
Olympia CM-698R
Olympia CM-730
Olympia CM-735
Olympia CM-888
Olympia CM-888 K
Olympia CM-898
Olympia CM-898 R
Olympia CM-899
Omniprint OPC-910
Walther ECR 82
Walther ECR 88