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 Den Mat CorpfiledCriticalDen Mat Corp
Priority claimed from PCT/US1987/001592external-prioritypatent/WO1988000043A1/en
Application grantedgrantedCritical
Publication of ATE99163T1publicationCriticalpatent/ATE99163T1/de