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...able raw materials such as trees, square steel, aluminum, and other metal tube, even bamboo and recycled thermoplastics. Aluminum frame members retain perfect interchangeability and reusability after years ...

...lar wood joinery. This then advanced to newer materials, like iron, steel, aluminum, and most recently composite materials like fiber-reinforced plastic. In mo ...use of softer recyclable plastics, though these are also made with milled aluminum for more durable structures. At present these are limited to small scales a ...