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Priority claimed from US06/508,831external-prioritypatent/US4481125A/en
Application filed by Houghton & Co E FfiledCriticalHoughton & Co E F
Priority claimed from EP84902420Aexternal-prioritypatent/EP0148215B1/de
Application grantedgrantedCritical
Publication of ATE60620T1publicationCriticalpatent/ATE60620T1/de