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 EP91302987Aexternal-prioritypatent/EP0452042B1/en
Application filed by Permutit Co LtdfiledCriticalPermutit Co Ltd
Priority to SG163794ApriorityCriticalpatent/SG163794G/en
Publication of SG163794GpublicationCriticalpatent/SG163794G/en