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
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Application filed by British Railways BoardfiledCriticalBritish Railways Board
Priority to NL6510365ApriorityCriticalpatent/NL145954B/xx
Publication of NL6510365ApublicationCriticalpatent/NL6510365A/xx
Publication of NL145954BpublicationCriticalpatent/NL145954B/xx