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Priority claimed from GB888805208Aexternal-prioritypatent/GB8805208D0/en
Priority claimed from GB888829061Aexternal-prioritypatent/GB8829061D0/en
Application filed by Northern Eng IndfiledCriticalNorthern Eng Ind
Priority claimed from EP89302101Aexternal-prioritypatent/EP0343767B1/en
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Publication of ATE100554T1publicationCriticalpatent/ATE100554T1/en