Index to the U.S. patent classification.
December 1980.

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Related Names
United States. Patent and Trademark Office.
Language(s)
English
Published
[Washington, D.C.] : U.S. Dept. of Commerce, Patent and Trademark Office : 1981]
Subjects
Patents > United States > Classification.
Patents > United States > Indexes.
Indexes
Classification
Note
Indexes Manual of classification.
Physical Description
viii, 233 p. ; 28 cm.
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