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 US06/531,561external-prioritypatent/US4520678A/en
Application filed by Foxboro CofiledCriticalFoxboro Co
Application grantedgrantedCritical
Publication of ATE49656T1publicationCriticalpatent/ATE49656T1/de