International patent classification.
Contributors: World Intellectual Property Organization.
Edition: 5th ed.
Publisher: World Intellectual Property Organization; C. Heymanns Verlag
Published: 1989
Place of publication: [Geneva, Switzerland]; München
Language: eng
Subjects: Patents -- Classification.
Table of contents: value: v. 1. Section A, human necessities; value: v. 2. Section B, performing operations, transporting; value: v. 3. Section C, chemistry, metallurgy; value: v. 4. Section D, textiles, paper; value: v. 5. Section E, fixed constructions; value: v. 6. Section F, mechanical engineering, lighting, heating, weapons, blasting; value: v. 7. Section G, physics; value: v. 8. Section H, electricity; value: v. 9. Guide, survey of classes, and summary of main groups.