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
Priority claimed from CH1836270Aexternal-prioritypatent/CH563327A5/de
Priority claimed from CH674871Aexternal-prioritypatent/CH575900A5/de
Application filedfiledCritical
Publication of CS176196B2publicationCriticalpatent/CS176196B2/cs