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 US05/721,203external-prioritypatent/US4139646A/en
Application filed by E GastrockfiledCriticalE Gastrock
Priority to IN287/DEL/80ApriorityCriticalpatent/IN149806B/en
Publication of IN149806BpublicationCriticalpatent/IN149806B/en