World Intellectual Property Organization. (1979). Official catchword index to the third edition (1979) of the International Patent Classification. C. Heymans Verlag KG.
Citace podle Chicago (17th ed.)World Intellectual Property Organization. Official Catchword Index to the Third Edition (1979) of the International Patent Classification. München: C. Heymans Verlag KG, 1979.
Citace podle MLA (8th ed.)World Intellectual Property Organization. Official Catchword Index to the Third Edition (1979) of the International Patent Classification. C. Heymans Verlag KG, 1979.
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