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1 | Title: | Additional improvement patents, 1837-1861 | |
Creator: | United States National Archives and Records Service. | ||
Paulauskas, James A., 1929- | |||
Publication: | National Archives and Records Service, General Services Administration, Washington,1977. | ||
Notes: | Includes indexes. | ||
Call #: | Pam. U241 | ||
Extent: | vii, 22 p. ; 27 cm. | ||
Subjects: | Patents -- United States | Patent extensions -- United States | ||
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