Additional improvement patents, 1837-1861
By: compiled by James A. Paulauskas.
Contributors: Paulauskas, James A., 1929-
Series: Special list - National Archives and Records Service ; no. 39; Special list (National Archives (U.S.)) ;; no. 39.
Publisher: National Archives and Records Service, General Services Administration
Published: 1977
Place of publication: Washington
Language: eng
Number of pages: 22
Subjects: Patents -- United States.; Patent extensions -- United States.
Notes: Includes indexes.