what substances make up brass
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what substances make up brass
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what substances make up brass, what elements make up brass, what makes up brass, what are the constituents of brass, what does brass contain, what elements are in brass, what elements are brass made of, brass contains what metals, brass in made of what, what metals in brass, brass made of what metals, main component of brass, chemical composition of brass, primary constituents of brass, chemical composition of brass material, chemical makeup of brass