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Classification Resources
 

Index to the United States Patent Classification (USPC) System
 
   Preface to the Index to the USPC  
   Select the format and section (by letter) ...  
   Index in HTML A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
   Index in PDF A B C D E F G H I J K L M N O P Q R S T U V W X Y Z