U.S. patent 5421054: Swimming pool cleaner discs. Granted to Dawson et. al. (6 total) on 1995-06-06 (filed 1993-08-06) and assigned to Zarina Holding C.V.. Currently involved in at least 1 patent litigation: Zodiac Pool Systems, Inc. v. Fibropool Co. LLC (California). See http://news.priorsmart.com for more info.
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