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WO patent 1985002540Архив на оригинала от 2011-08-05 в Wayback Machine., Sunshine A, Laska EM, Siegel CE, "ANALGESIC AND ANTI-INFLAMMATORY COMPOSITIONS COMPRISING XANTHINES AND METHODS OF USING SAME", granted 1989-03-22, assigned to RICHARDSON-VICKS, INC.
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WO patent 1985002540Архив на оригинала от 2011-08-05 в Wayback Machine., Sunshine A, Laska EM, Siegel CE, "ANALGESIC AND ANTI-INFLAMMATORY COMPOSITIONS COMPRISING XANTHINES AND METHODS OF USING SAME", granted 1989-03-22, assigned to RICHARDSON-VICKS, INC.