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[i]The Apollo suits all used a two-zipper system, one overlapping the other. One was known as the pressure-sealing zipper, or closure, and the other was called the restraint zipper. The pressure-sealing zipper was located underneath the restraint zipper and was glued onto the pressure-bladder layer to form an integral, leak-free assembly. Together, the pressure bladder and pressure-sealing zipper worked to retain the pressure of the gas inside the suit. The restraint zipper was sewn to the restraint layers of the suit and took the structural loads and prevented the pressure zipper from being subjected to any structural loads under pressure. That was because the patterns that made the pressure bladder were cut larger than the outer restraint layers, thus there was some slight excess material underneath so that no loading would be experienced.[/i]
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