When was the current edition of the HP LaserJet Pro MFP M28-M31 technical manual published?
The current edition of the technical specifications manual is Edition 3, published in July 2019. The manual is copyrighted by HP Development Company, L.P. with a copyright year of 2018. (Page 2)
From the official HP Laserjet Pro Mfp M28 M31 Printer manual, page 2
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