If the outlet boxes are metal, and connected to each other with metal conduit, and provided that the said boxes and conduit are grounded properly, you can go to Home Depot or Lowe's and buy a $0.39 self-grounding receptacle. Obviously if the boxes are not metal, or otherwise not grounded, this will not satisfy any codes or safety concerns. My 1924 house is this way -- metal boxes and conduit with only two wires, but since all are grounded, this is how I fixed the two-prong situation. hope this helps.
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