The Traffic Light
The First Traffic Light was invented by British railway engineer J.P. Knight and what we know as railroad signals. The electric red-green traffic light was invented by Lester Wire in 1912.
It was first installed in Cleveland Ohio, and is now found in every nation.
The First Typewriter Invented was in 1847 by Alfred Beach, the first practical typewriter was invented by a Wisconsin newspaperman Christopher Sholes in 1871.
The Telephone was invented in 1876 by Elisha Gray and Alexander Bell. The first successful experiment was executed March 10, 1876 when Bell had Mr. Watson, his assistant in a separate room who clearly heard “Mr.Watson, come here, I want to see you”
The Mobile phone was invented in 1973 by Martin Cooper of Motorola. Now you can Carry your phones everywhere! Most common place we keep them is our pocket and/or purse.
By 2007 of approximately 4 billion mobile and fixed line subscribers and over 1 billion Internet users worldwide including 1.27 billion fixed line subscribers and 2.68 billion mobile subscribers.
Manufacturers: Nokia is the world’s largest phone manufacturer from Finland with a plant in Romania. Motorola is the largest American manufacturer of cell phones and second largest in the world.
The Radio was first Invented by Mahlon Loomis in July 1872 for a “wireless telegraph” however David Hughes was the first to transmit and receive radio waves in 1878.
Sources: Wikipedia.com, google.com, about.com, The Franklin Institute.edu , plunkettresearch.com, History of Communications-Electronics in the United States Navy, Captain Linwood S Howeth, USN (Retired) 1963.