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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

In addition to preventing oil leaks, oil seals also help to keep contaminants out of the motor. Dust, dirt, and debris can cause damage to the internal components of the motor if they are allowed to enter. The oil seal acts as a barrier to keep these harmful substances out and maintain the cleanliness of the motor.