Index to the U.S. patent classification.
|Previous Title:||United States. Patent Office. Index to classification|
|Format:||Journal / Magazine|
[Washington, D.C.] :
U.S. Dept. of Commerce, Patent and Trademark Office : [Supt. of Docs., U.S. G.P.O., distributor,
United States. > Patent and Trademark Office. > Office of Documentation Planning and Support. > Manual of classification > Indexes > Periodicals.
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Lewis & Clark Community College