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 GB8823670Aexternal-prioritypatent/GB2223486B/en
Application filed by George A WillacyfiledCriticalGeorge A Willacy
Application grantedgrantedCritical
Publication of ATE87284T1publicationCriticalpatent/ATE87284T1/de