Index to the U.S. patent classification. December 1989.
Title:
Index to the U.S. patent classification. December 1989.
Author:
United States. Patent and Trademark Office.
Corporate Author:
Publication Information:
[Washington, D.C.] : U.S. Dept. of Commerce, Patent and Trademark Office : [U.S. G.P.O.], [1990]
Physical Description:
ii, 7 pages, 237 pages ; 28 cm
General Note:
Indexes Manual of classification.
Language:
English
Format :
Book