Another page from my 1895 Columbus, Ohio business promotional book. This page is a wonderfully illustrated cut from the Ohio Paving Company. They offered: 'Manufacturers of the Patent Hallwood Block For Street Paving, Interlocking Rail Blocks, Subsoil Drainage Curb, or Electrical Wire Conductors'. Perhaps a manufacturer of some of those 'brick' spools mentioned on ICON recently? Just a thought.