United States. Patent Office

Also known as

United States. Patent Office

Identifiers

  • Open LibraryOL4527492A

Top Subjects

  • United States (78)
  • Patents (41)
  • Patent laws and legislation (17)
  • Patents -- United States (14)
  • Trademarks (14)
  • Electric machinery (14)
  • Electric apparatus and appliances (14)

Books by United States. Patent Office

Total count: 191