Catalog Record: Index to classification of patents | HathiTrust Digital Library

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Index to classification of patents.

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Corporate Author: United States.
Language(s): English
Published: [Washington, U.S. Govt. Print. Off.] 1947.
Subjects: Patents > Patents / Classification.
Patents > Patents / United States > Patents / United States / Indexes.
Note: At head of title: Department of Commerce. United States Patent Office.
Physical Description: 179 p. 27 x 20 cm.
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