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 filedfiledCritical
Priority to SU1768668ApriorityCriticalpatent/SU410082A1/ru
Application grantedgrantedCritical
Publication of SU410082A1publicationCriticalpatent/SU410082A1/ru
Anordning for aa skille fra hverandre to medier som befinner seg i hvert sitt rom paa hver sin side av en ringformet aapning mellom to deler som er bevegelige i forhold til hverandre