Invention of the Typewriter

http://www.typewritermuseum.org/history/inventors_sholes.html

Invention of the Telephone

http://www.juliantrubin.com/bigten/telephoneexperiments.html

Invention of Barbed Wire

http://www.barbwiremuseum.com/barbedwirehistory.htm

Invention of Chewing Gum

http://www.ideafinder.com/history/inventions/chewgum.htm

Invention of the Hand Held Kodak Camera

http://www.juliantrubin.com/bigten/eastmancamera.html