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1. International patent classification 1979

by -- World Intellectual Property Organization

Edition: 3rd ed. Type: book Book; Format: print ; Literary form: not fiction Publisher: Munchen: Carl Heymanns Verlag, 1980Availability: Copies available for loan: CSIR-HQRS [347.771:025.4 ] (5).

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2. International Patent Classification 1989

by -- World Intellectual Property Organization

Type: book Book; Format: print ; Literary form: not fiction Publisher: Munchen: Carl Heymanns Verlag Availability: Copies available for loan: CSIR-HQRS [347.771:025.4 M9] (9).

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