How do I find the model number of my HP Officejet Pro 8600 printer?
The model number is printed on a label located on the inside of the ink cartridge access door, near the ink cartridges area. You can use this number when obtaining support and to help determine which supplies or accessories are available for your printer. (Page 23)
From the official HP Officejet Pro 8600 E All-in-One Printer N911a manual, page 23
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