PBS
Pbs: Transistorized!
This site provides a tour of the discovery and development of the transistor form PBS, including video and lesson plans.
National Academy of Engineering
Greatest Achievements: Telephone
This resources features an overview of the history behind the technological development of the telephone today and a timeline showing the important dates.
Great Idea Finder
The Great Idea Finder: Invention of the Telephone
The Great Idea Finder provides information on the invention of the telephone by Alexander Graham Bell and its history throughout the years. Links to other sites with information are provided.