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 N Proizv Ob Kamen I SilikatyfiledCriticalN Proizv Ob Kamen I Silikaty
Priority to IT41554/85ApriorityCriticalpatent/IT1188525B/en
Publication of IT8541554A0publicationCriticalpatent/IT8541554A0/en
Application grantedgrantedCritical
Publication of IT1188525BpublicationCriticalpatent/IT1188525B/en