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 Nat Council Cement & BuildingfiledCriticalNat Council Cement & Building
Priority to IN150/DEL/86ApriorityCriticalpatent/IN169686B/en
Priority to IN499/DEL/89Aprioritypatent/IN169814B/en
Publication of IN169686BpublicationCriticalpatent/IN169686B/en