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 Optische Ind De Oude Delft NvfiledCriticalOptische Ind De Oude Delft Nv
Priority to IN573CA1989priorityCriticalpatent/IN172863B/en
Priority to IN187CA1993prioritypatent/IN175880B/en
Publication of IN172863BpublicationCriticalpatent/IN172863B/en