International patent classification
International patent classification
/ WIPO
- Geneva: WIPO, 1999
- 7th ed. .
Vol. 5 (Section E: Fixed constructions); ISBN: 92-805-0795-8; 79p.
92-805-0795-8
Library science
Patent classification
D 025.4PATENt N9
Vol. 5 (Section E: Fixed constructions); ISBN: 92-805-0795-8; 79p.
92-805-0795-8
Library science
Patent classification
D 025.4PATENt N9