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

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