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Priority claimed from US06/555,136external-prioritypatent/US4488909A/en
Application filed by United States Gypsum CofiledCriticalUnited States Gypsum Co
Publication of NO852955LpublicationCriticalpatent/NO852955L/no
Publication of NO166033BpublicationCriticalpatent/NO166033B/no
Publication of NO166033CpublicationCriticalpatent/NO166033C/no