These printers use the T-6000 cartridge:

Toshiba e STUDIO 520

Toshiba e STUDIO 520-52CPM

Toshiba e STUDIO 600

Toshiba e STUDIO 600-60CPM

Toshiba e STUDIO 720

Toshiba e STUDIO 720-72CPM

Toshiba e STUDIO 850

Toshiba e STUDIO 850-85CPM

Panasonic WORKiO DP-6540

Panasonic WORKiO DP-7240

Panasonic WORKiO DP-8540