International patent classification
International patent classification
/ WIPO
- Geneva: WIPO, 1994
- 6th ed. .
Vol. 1 (Section A: Human necessities); ISBN: 92-805-0791-5; 163p.
92-805-0791-5
Library science
Patent classification
D 025.4PATENt N9
Vol. 1 (Section A: Human necessities); ISBN: 92-805-0791-5; 163p.
92-805-0791-5
Library science
Patent classification
D 025.4PATENt N9