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for all awarded projects. The "SS" represents Support System, the "463" represents an assigned general system category, 400-499 series for "Support Systems", and the suffix "L" also represents "Support Systems". The "463L" does not stand for the period that the pallet was initiated (April 1963); it is the name of the system. The standard HCU-6/E pallet in the "463L" system was designed and finalized in the early 1960s by the AAR Cadillac Corp. to implement the "SS-463L Pallet Cargo Handling System" now known as "Materials Handling Support System

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