Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB7942237Aexternal-prioritypatent/GB2061025A/en
Priority claimed from GB8014718Aexternal-prioritypatent/GB2054781A/en
Application filed by A.C. Egerton LimitedfiledCriticalA.C. Egerton Limited
Priority claimed from EP80302530Aexternal-prioritypatent/EP0023418B1/en
Application grantedgrantedCritical
Publication of ATE5019T1publicationCriticalpatent/ATE5019T1/en