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Royal DID make a line of metal uprights that were indeed meant to be sold to residential users.The "commercial" Royal uprights have the 3 wire cords and plugs to meet OSHA safety requirements.The residential models had the two pin cords and plugs.I have BOTH in my collection.For commjercial-if the vacuum has a metal body or metal parts that can be touched by the user they had to be grounded by the grounding plug and cord.
