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.)
Filing date
Publication date
Priority claimed from US06/862,987external-prioritypatent/US4741329A/en
Application filed by Lehigh Group LtdfiledCriticalLehigh Group Ltd
Application grantedgrantedCritical
Publication of ATE79529T1publicationCriticalpatent/ATE79529T1/en