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Duralumin, Dural
From WikiPedalia
Duralumin is a trade mark name for an early popular structural aluminium (aluminum) alloy, and 'dural' is slang for it. Dural has a poor corrosion resistance, and (I hope) isn't used much for cycle parts nowadays. It needs a paint or lacquer finish if used out of doors in dirty conditions. (Thanks to Mark Irving)
