Patents and Standards
The United States Patent and Trademark Office (US PTO) issued patent # 1,125,095 dated 15 January 1915 to William J. Hickey, Reno, Nevada.
There is a British Standard for cattle grids: BS4008:2006. The US standards are put forth by The American Association of State Highway and Transportation Officials (AASHTO). AASHTO provides load rating guidelines for cattle guards that are used on public roads in the US. All cattle guards used on American public roads must be certified by a qualified engineer that the guard meets AASHTO guidelines.
Read more about this topic: Cattle Grid
Famous quotes containing the word standards:
“Barbarism is the absence of standards to which appeal can be made.”
—José Ortega Y Gasset (1883–1955)