HP 4200 series - Manual (Page 17)

user guide
hp officejet overview
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20 Keypad : Enter fax numbers, values, or text.
21 One-Touch Speed Dial : Dial a fax number quickly by pressing a
one-touch speed dial button. The 5 one-touch speed dial buttons
each hold 2 numbers and correspond to the first 10 fax numbers
entered during speed dial setup.
feature purpose