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 Steinfabrik Ulm ActiengesellscfiledCriticalSteinfabrik Ulm Actiengesellsc
Publication of CH30967ApublicationCriticalpatent/CH30967A/en