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 GB28663/58Aexternal-prioritypatent/GB930640A/en
Priority claimed from FR837396Aexternal-prioritypatent/FR1266331A/fr
Application filed by Parr Equipment Company LtdfiledCriticalParr Equipment Company Ltd
Publication of BE596177ApublicationCriticalpatent/BE596177A/fr