INRA i razvitieto na izobretatelstvoto v Bŭlgarii︠a︡
By: Vladimir I︠A︡. Vrana
Edition: 1. izd.
Series: Biblioteka na izobretateli︠a︡ i rat︠s︡ionalizatora
Publisher: Dŭrzh. izd-vo "Tekhnika"
Published: 1988
Place of publication: Sofii︠a︡
Language: bul
Number of pages: 67
Subjects: Inventions; Patent laws and legislation