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Priority claimed from GB8822127Aexternal-prioritypatent/GB2224725A/en
Application filed by Watts Blake Bearne & Co LtdfiledCriticalWatts Blake Bearne & Co Ltd
Priority claimed from EP89309482Aexternal-prioritypatent/EP0360547B1/en
Application grantedgrantedCritical
Publication of ATE91677T1publicationCriticalpatent/ATE91677T1/en