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 IN150/DEL/86Aexternal-prioritypatent/IN169686B/en
Application filed by Nat Council Cement & BuildingfiledCriticalNat Council Cement & Building
Priority to IN499/DEL/89ApriorityCriticalpatent/IN169814B/en
Publication of IN169814BpublicationCriticalpatent/IN169814B/en