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 US07/250,157external-prioritypatent/US4914962A/en
Application filed by Slope Indicator CofiledCriticalSlope Indicator Co
Application grantedgrantedCritical
Publication of ATE105405T1publicationCriticalpatent/ATE105405T1/de