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 US05/908,482external-prioritypatent/US4161888A/en
Application filed by Dresser IndfiledCriticalDresser Ind
Priority to IN639/DEL/82ApriorityCriticalpatent/IN155259B/en
Publication of IN155259BpublicationCriticalpatent/IN155259B/en