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 US06/456,686external-prioritypatent/US4520986A/en
Application filed by Caterpillar Ind IncfiledCriticalCaterpillar Ind Inc
Publication of HK890ApublicationCriticalpatent/HK890A/en