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 US06/115,160external-prioritypatent/US4352103A/en
Priority claimed from US06/159,597external-prioritypatent/US4347563A/en
Priority claimed from US06/202,471external-prioritypatent/US4402082A/en
Application filed by Forney InternationalfiledCriticalForney International
Publication of MX156711ApublicationCriticalpatent/MX156711A/en