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 IN389/CAL/78Aexternal-prioritypatent/IN148266B/en
Application filed by Minnesota Mining & MfgfiledCriticalMinnesota Mining & Mfg
Priority to IN919/CAL/80ApriorityCriticalpatent/IN151249B/en
Publication of IN151249BpublicationCriticalpatent/IN151249B/en