What models of HP Notebook PC use aluminum alloy on their surfaces?

Models announced in calendar year 2008 include the HP EliteBook Series, HP 2133 Mini-Note PC, HP 2533t Mobile Thin Client, and docking stations like the Advanced Docking Station with aluminum alloy used on display enclosures and areas surrounding keyboards.

From the official HP 346 G4 Notebook PC manual, page 2

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