Title: Nauchno-tekhnicheska konferent͡sii͡a po vnedri͡avane na nauchno-tekhnicheskite postizhenii͡a--faktor za povishavane kachestvoto na produkt͡sii͡ata, 11. XI. 1977 god., Shumen
Subjects: Congresses, Quality of products, Technological innovations