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 IN931/CAL/80Aexternal-prioritypatent/IN153203B/en
Priority claimed from FR8021735Aexternal-prioritypatent/FR2491889A2/fr
Application filed by Saint Gobain IsoverfiledCriticalSaint Gobain Isover
Priority to IN1130/CAL/81ApriorityCriticalpatent/IN154259B/en
Publication of IN154259BpublicationCriticalpatent/IN154259B/en