International patent classification
International patent classification
/ WIPO
- Geneva: WIPO, 1994
- 7th ed. .
Vol. 9 (Guide, survey of classes and summary of main groups); ISBN: 92-805-0510-6; 313p.
92-805-0510-6
Library science
Patent classification
D 025.4PATENt N4.9
Vol. 9 (Guide, survey of classes and summary of main groups); ISBN: 92-805-0510-6; 313p.
92-805-0510-6
Library science
Patent classification
D 025.4PATENt N4.9