Knowledge Resources | Dar Al-hikmah Library | Public Access
Subject(s): Patents -- Classification Contents:v. 1. Section A, human necessities -- v. 2. Section B, performing operations, transporting -- v. 3. Section C, chemistry, metallurgy -- v. 4. Section D, textiles, paper -- v. 5. Section E, fixed constructions -- v. 6. Section F, mechanical engineering, lighting, heating, weapons, blasting -- v