Classification bulletin of the United States Patent Office, Apr. 1 and June 30, 1941, Number 80.

Bibliographic Details

Corporate Author:	United States. Patent Office
Format:	Government Document eBook
Language:	English
Published:	[Washington] : [publisher not identified], 1941.
Subjects:	Fertilizers. Electric power. Explosives. Engines. Packaging. Photography. Printing. Typewriters.
Online Access:	Electronic resource (PDF)