Concordance: [guide for relating the] United States patent classification to international patent classification.
Contributors: United States. Patent Office. Office of Documentation.
Edition: 2d ed.
Publisher: For sale by the Supt. of Docs., U.S. Govt. Print. Off.]
Published: 1971
Place of publication: [Washington
Language: eng
Number of pages: 199
Subjects: Patents -- United States -- Classification.
Notes: 1st ed. issued by the Office under its earlier name: Office of Documentation.