Concordance, United States patent classification to international patent classification.
Contributors: United States. Patent Office. Office of Search Systems and Documentation.
Edition: 4th ed.
Publisher: U.S. Dept. of Commerce, Patent and Trademark Office, Patent Documentation Organizations; for sale by the Supt. of Docs., U.S. Govt. Print. Off.
Published: 1980
Place of publication: [Washington, D.C.]; Washington
Language: eng
Number of pages: 148
Subjects: Patents -- United States -- Classification.
Notes: Second ed. issued by United States Patent Office, Office of Search Systems and Documentation.
"January 1980."