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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Priority claimed from US07/194,822external-prioritypatent/US4869740A/en
Application filed by Elcor CorpfiledCriticalElcor Corp
Priority to IN119/BOM/89ApriorityCriticalpatent/IN170483B/en
Publication of IN170483BpublicationCriticalpatent/IN170483B/en