• publisher: Philadelphia, Porter and Coates
  • creator: Howson, Henry, 1823-1885 Howson, Charles, joint author
  • contributor: Howson, Charles, joint author.
  • Keyword: Patents United States.
  • years: 1876.
  • pages: ix, 10-164 p.
  • class: T223.Z1
  • download: pdf file