Evolution of the Telephone

I remember the finger dial....I have a cordless answer phone at home....with caller ID, and an I-phone 5, which I love!
 
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The telephone was actually one of those wonderfully accidental inventions. Ol' Al was working on a device to help the hard of hearing. His wife suffered from hearing loss. While mucking around in the lab, he spilled some battery acid and called to his assistant for help. Watson heard him through the receiver of their experiment and thus . . . 911 came to be.
 
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