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 GB3021659Aexternal-prioritypatent/GB965541A/en
Priority claimed from FR844855Aexternal-prioritypatent/FR1274177A/en
Application filed by Plessey Co LtdfiledCriticalPlessey Co Ltd
Publication of BE597645ApublicationCriticalpatent/BE597645A/en