International Patent Classification 1989 - Munchen: Carl Heymanns Verlag - v.p. - 5th ed. .

v.1A Human necessities
v.2B Performing operations; Transporting
v.3C Performing chemistry; Metallurgy
v.4D Textile; Paper
v.5E Fixed constructions
v.6F Mechanical engineering, lighting, heating,weapons, blasting
v.7G Physics
v.8H Electricity
v.9 Guide, survey of classes and summary of main groups


Patent classification
Intellectual Property (International law)
Patent--Law and legislation

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