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- 71027687 contributor B2021019.
- 71027687 created "1970.".
- 71027687 date "1970".
- 71027687 date "1970.".
- 71027687 dateCopyrighted "1970.".
- 71027687 description "Includes bibliographical references.".
- 71027687 extent "75 p.".
- 71027687 issued "1970".
- 71027687 issued "1970.".
- 71027687 language "eng".
- 71027687 publisher "Sofia, Patent and Trade Mark Bureau,".
- 71027687 spatial "Bulgaria.".
- 71027687 subject "346/.497/7048".
- 71027687 subject "Industrial property Bulgaria.".
- 71027687 subject "LAW".
- 71027687 title "Protection of industrial property in the People's Republic of Bulgaria [by] G. Dobrev.".
- 71027687 type "text".