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
Application filed by Western Atlas Int IncfiledCriticalWestern Atlas Int Inc
Priority to NO843775ApriorityCriticalpatent/NO161888C/en
Publication of NO843775LpublicationCriticalpatent/NO843775L/en
Publication of NO161888BpublicationCriticalpatent/NO161888B/en
Publication of NO161888CpublicationCriticalpatent/NO161888C/en