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Alexander Graham Bell discovered he could hear sound over wire
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Period: to
Telephone timeline
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Telephone invented by Bell
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Bell system companies begin to install switching systems and rotary dial telephones
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Bell Labs and AT&T develop the north american numbering system
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Touch tone telephone is introduced with 10 push buttons
The 10 button phone is soon replaced with a 12 button phone with * and #. -
1st 911 call made
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First portable cell phone made by Martin Cooper of Motorola
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100 million cellular telephone subscribers
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Lots of new super high-tech phones made like the leaf phone
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Citations
Works Cited
Bells, Mary. "Inventors." About.com. About.com, 2012. Web. 30 Oct. 2012. http://inventors.about.com/.
First portable cell phone by Motorola. Digital image. Is Your Smartphone a Reflection of You? Wordpress, n.d. Web. 30 Oct. 2012. <rangaprabhu.com>.
First telephone. Digital image. Martinez Historical Society. N.p., n.d. Web. 30 Oct. 2012. <martinezhistory.org>.
"Greatest Engineering Achievements of the Twentieth Century." Greatest Engineering Achievements of the Twentieth Centu
