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Patent extensions -- United States in subject [X]
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Patent extensions -- United States[X]
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1Title:  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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