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An alloy containing principally aluminum, approximately 4% copper, 0.2 to 0.75% magnesium, and 0.4 to 1% manganese; individual manufacturers may […]

A measure of the change (with time) in the property of a material as a result of exposure to an

1. The ability of a material, component, assembly, or building to resist weathering action, chemical attack, abrasion, and other conditions

A house having quarters, with separate entrances, for two families; usually a two-story house with a separate apartment on each

An electric cable consisting of two individually insulated conductors which are twisted together.

In a heating system, a gas burner having two sections which can either burn together at full load or be

A separate dwelling in an apartment building, having rooms on two levels, with self-contained vertical circulation.