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 US05/934,832external-prioritypatent/US4227543A/en
Application filed by Cameron Iron Works IncfiledCriticalCameron Iron Works Inc
Publication of MX157233ApublicationCriticalpatent/MX157233A/es