Cover Image

U.S. patent classification. Subclass listing.

Bibliographic Details
Corporate Author: United States. Patent and Trademark Office
Format: Microform Journal
Language:English
Published: Washington : United States Patent and Trademark Office.
Subjects:
Patents > United States.
Patents > United States > Classification.
Description
Published:1843-
Item Description:Microform.
Physical Description:volumes : illustrations ; 25 cm.
Publication Frequency:Semiannual