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The official gazette of the United States Patent Office, [title page, contents, etc., to] v. 502; May 1939.

Bibliographic Details
Corporate Author:	United States. Patent Office
Format:	Government Document eBook
Language:	English
Published:	[Washington] : [s.n.], 1939.
Subjects:	United States. > Patent Office. Patents.
Online Access:	Electronic resource (PDF)

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