International patent classification
International patent classification
/ WIPO
- Geneva: WIPO, 1994
- 6th ed. .
Vol. 7 (Section G: Physics); ISBN: 92-805-0508-4; 172p.
92-805-0508-4
Library science
Patent classification
D 025.4PATENt N4.7
Vol. 7 (Section G: Physics); ISBN: 92-805-0508-4; 172p.
92-805-0508-4
Library science
Patent classification
D 025.4PATENt N4.7