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HP Printer Compatibility List

Black Cartridge Number: HP 51640A (HP 40)
Color Cartridge Number: HP 51650C, 51650M, 51650Y (HP 50)
see available products for these cartridges back to HP list

HP printer models using the HP 40 black and HP 50 color inkjet cartridges:

HP Designjet 250C (shown at left)
HP Designjet 650C/PS