International patent classification
Subtitle: revision concordance list.
Contributors: World Intellectual Property Organization.
Edition: 4th ed.
Series: WIPO publication ;; no. 462
Publisher: World Intellectual Property Organization
Published: 1984
Place of publication: [Geneva, Switzerland]
Language: eng
Number of pages: 68
Subjects: International Patent Classification -- Concordances.
Notes: "List indicating subject matter classified differently according to the third and fourth editions of the International patent classification."