Item Serupa

• Manual of classification of subjects of invention of the United States Patent Office. Revised to January 1, 1912 (including Classification bulletin no. 27)
  Diterbitkan: (1912)
• Manual of classification of subjects of invention of the United States Patent office. Rev. to January 1, 1920 (including classification bulletin no. 43)
  Diterbitkan: (1920)
• The classification of patents.
  Diterbitkan: (1946)
• Index to the U.S. patent classification.
  Diterbitkan: (1977)
• Manual of classification of patents.
  Diterbitkan: (1929)