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 Amstutz Levin & Cie Societe AnfiledCriticalAmstutz Levin & Cie Societe An
Publication of CH273808ApublicationCriticalpatent/CH273808A/fr