International patent classification
International patent classification
/ WIPO
- Geneva: WIPO, 1999
- 7th ed. .
Vol. 6: Guide; ISBN: 92-805-0800-8; 30p.
92-805-0800-8
Library science
Patent classification
D 025.4PATENt N9
Vol. 6: Guide; ISBN: 92-805-0800-8; 30p.
92-805-0800-8
Library science
Patent classification
D 025.4PATENt N9