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 Cleveland Trencher CofiledCriticalCleveland Trencher Co
Priority to BE588946ApriorityCriticalpatent/BE588946A/fr
Publication of BE588946ApublicationCriticalpatent/BE588946A/fr