International patent classification
International patent classification
/ WIPO
- Geneva: WIPO, 1999
- 7th ed. .
Vol. 3 (Section C: Chemistry; Metallurgy); ISBN: 92-805-0791-5; 281p.
92-805-0793-1
Library science
Patent classification
D 025.4PATENt N9
Vol. 3 (Section C: Chemistry; Metallurgy); ISBN: 92-805-0791-5; 281p.
92-805-0793-1
Library science
Patent classification
D 025.4PATENt N9