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The factory process behind metal lunch boxes often involved a series of intricate steps. First, the raw materials were sourced and cut into the appropriate sizes. Next, the metal sheets underwent printing, where vibrant colors were applied to create eye-catching designs. The pieces were then shaped, bent, and fused together, creating a sturdy construction that could withstand the rigors of daily use. Finally, a protective coating was applied to guard against rust, ensuring these lunch boxes would endure for years.
metal lunch boxes vintage factory

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Manufacturers of perforated galvanized angle iron also cater to the automotive and aerospace industries, where lightweight yet robust materials are crucial
. The ability to customize the dimensions and hole patterns in the angle iron allows engineers to design components that meet specific load-bearing and weight requirements, ultimately enhancing the overall performance of vehicles and aircraft.