Concordance, United States patent classification to international patent classification.
Edition: 5th ed.
Publisher: U.S. Dept. of Commerce, Patent and Trademark Office, Patent Documentation Organizations; For sale by the Supt. of Docs., U.S. G.P.O.
Published: 1985
Place of publication: [Washington, D.C.]
Language: eng
Number of pages: 174
Subjects: Patents -- United States -- Classification.
Notes: "January 1985."