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 Osvald HamerskyfiledCriticalOsvald Hamersky
Priority to CS890571ApriorityCriticalpatent/CS179474B1/cs
Publication of CS179474B1publicationCriticalpatent/CS179474B1/cs