International patent classification 1979
- 3rd ed.
- Munchen: Carl Heymanns Verlag, 1980
- v.p.
v. 5(sec.E)- Fixed constructions
v. 1(sec.A)- Human necessities
v. 4(sec.D)- Textiles and paper
v. 3(sec.H)- Electricity
v. 7(sec.G)- Physics
Patent Classification
Intellectual Property (International law)
Patents --Law and legislation