For instance, scrap with low phosphorus levels must be chosen if ... elements that have to be monitored at very low levels such as lead, copper, and tin, ... Steel wire which is to be used for aerospace or high-performance tires ...
Phosphorus, a key element in the animal droppings, is one of the most carefully ... A successor to the humble copper-wire telephone line, fiber optics carry all ... In the Iliad, Achilles' armor is forged from copper and tin by ...