International patent classification
International patent classification
/ WIPO
- Geneva: WIPO, 1994
- 7th ed. .
Vol. 9 (Section B: Performing operations; transporting); ISBN: 92-805-0503-3; 352p.
92-805-0503-3
Library science
Patent classification
D 025.4PATENt N4.2
Vol. 9 (Section B: Performing operations; transporting); ISBN: 92-805-0503-3; 352p.
92-805-0503-3
Library science
Patent classification
D 025.4PATENt N4.2