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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Publication date
Priority claimed from CH1181/85Aexternal-prioritypatent/CH667937A5/de
Priority claimed from IN236/DEL/86Aexternal-prioritypatent/IN170382B/en
Application filed by Schweizerische IsolawerkefiledCriticalSchweizerische Isolawerke
Priority to IN529/DEL/88ApriorityCriticalpatent/IN170350B/en
Publication of IN170350BpublicationCriticalpatent/IN170350B/en