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
Application filed by Geoffrey William BallfiledCriticalGeoffrey William Ball
Priority to GR851591ApriorityCriticalpatent/GR851591B/el
Publication of GR851591BpublicationCriticalpatent/GR851591B/el