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Application filed by Ct Nauk Prod ElektronikfiledCriticalCt Nauk Prod Elektronik
Priority to PL20108777ApriorityCriticalpatent/PL201087A1/pl
Publication of PL201087A1publicationCriticalpatent/PL201087A1/pl
PL20108777A1977-09-261977-09-26Urzadzenie zabezpieczajace miejsca niebezpieczne przed wtargnieciem osob zwlaszcza w wyrobiskach gorniczych
PL201087A1
(pl)