Legal status (The legal status 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 status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
American District Telegraph Co
Original Assignee
American District Telegraph Co
Filing date
Publication of AU492340B2publicationCriticalpatent/AU492340B2/en
Priority claimed from US05/545,388external-prioritypatent/US4023156A/en
Application filed by American District Telegraph CofiledCriticalAmerican District Telegraph Co
Publication of AU1061476ApublicationCriticalpatent/AU1061476A/en