International patent classification : core level. (WIPO, 2006)
Algunos datos tomados de la cubierta–Contenido: v.1 Sections A and B: Human necessities, performing operations, tranporting–v.2 Sections C and D: Chemistry, metallurgy, textiles, paper–v.3 Sections E and F: Fixed constructions, mechanical engineering, lighting, heating, weapons, blasting–v.4 Sections G and H: Physics, electricity–v.5 Guide to the IPC–ISBN 92-805-1438-5 (v.1)–ISBN 92-805-1439-3 (v.2)–ISBN 92-805-1440-7 (v.3)–ISBN 92-805-1441-5 (v.4)–ISBN 92-805-1442-3 (v.5)