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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Application filed by Esco CorpfiledCriticalEsco Corp
Priority to IN676/DEL/87ApriorityCriticalpatent/IN171354B/en
Priority claimed from CN 87211181external-prioritypatent/CN87211181U/zh
Publication of IN171354BpublicationCriticalpatent/IN171354B/en