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 US07/187,827external-prioritypatent/US4864474A/en
Application filed by Mag Instr IncfiledCriticalMag Instr Inc
Application grantedgrantedCritical
Publication of ATE103381T1publicationCriticalpatent/ATE103381T1/de