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.)
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Priority claimed from IN552/DEL/86Aexternal-prioritypatent/IN166517B/en
Application filed by Charbonnages Ste ChimiquefiledCriticalCharbonnages Ste Chimique
Priority to IN320DE1989priorityCriticalpatent/IN174704B/en
Publication of IN174704BpublicationCriticalpatent/IN174704B/en