These printers use the 491-0277 cartridge:
Lanier 7560 Fax
Lanier Fax 7560
Lanier LanierFax 7560
Lanier LanierFax 7570
Infotec 3673
Infotec 3674
Infotec 3675
Infotec 3685
Infotec Fax 3673
Infotec Fax 3674
Infotec Fax 3675
Infotec Fax 4010
Murata-Muratec 354
Nashuatec D 510
Nashuatec P 394
Nashuatec P 394 MFP
Nashuatec P 397
Nashuatec P 398
Nashuatec P 497
Nashuatec P 598
Rex 2110
Rex 6460
Rex 6490
Rex 6500
Rex 6860 Fax
Rex Fax 2110
Rex Fax 6460
Rex Fax 6490
Rex Fax 6500
Ricoh 2400 L
Ricoh 2700 L
Ricoh 3700 L
Ricoh 3800 L
Ricoh 4700 L
Ricoh 4800 L
Ricoh Fax 2400 L
Ricoh Fax 2700 L
Ricoh Fax 3700 L
Ricoh Fax 3800 L
Ricoh Fax 4700 L
Ricoh Fax 4800 L
Siemens Fax 770
Siemens Fax 790
Teleautograph OmniFax L-525
Teleautograph OmniFax L-535
Teleautograph OmniFax L-545