If installation is outside the fifty (50) states, the cost of installation is borne by the purchaser, and Absocold’s warranty obligations hereunder shall be limited to furnishing all replacement parts and materials, freight prepaid, to the continental United States port designated by the purchaser. In an effort to properly administer its warranty policy, Absocold Corporation or its representatives may require a proof-of-purchase document before authorizing service or repair to the appliance unde