What are the model numbers available for the HP LaserJet Pro MFP M28-M31 series?
The HP LaserJet Pro MFP M28-M31 series includes models M28a (W2G54A), M28w (W2G55A), M29a (W2G56A), M29w (Y5S53A), M30a (Y5S50A), M30w (Y5S54A), and M31w (Y5S55A). Each model has a unique product number for identification purposes. (Page 6)
From the official HP Laserjet Pro Mfp M28 M31 Printer manual, page 6
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