International patent classification 1979

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

Place Hold on International patent classification 1979

International Patent Classification 1989

Munchen: Carl Heymanns Verlag . v.p. , 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

Place Hold on International Patent Classification 1989

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International patent classification 1979

International Patent Classification 1989