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Priority claimed from GB2527278Aexternal-prioritypatent/GB1599919A/en
Priority claimed from GB25270/78Aexternal-prioritypatent/GB1599917A/en
Application filed by Exchem Holdings LimitedfiledCriticalExchem Holdings Limited
Priority claimed from EP79300978Aexternal-prioritypatent/EP0005988B1/de
Application grantedgrantedCritical
Publication of ATE190T1publicationCriticalpatent/ATE190T1/de