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03/27/2011 20:31

If you wish to succeed, you should use persistence as your good friend, experience as your reference, prudence as your brother and hope as your sentry.

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03/29/2011 02:28

At first, two iron wires connected each pair of telephones. Then switchboards brought phone wires into one location. Other inventions - the vacuum tube to amplify sound, and coaxial cables to link long distances on land and under the seas -- greatly expanded phone service. Transistors replaced the old vacuum tubes, and by the 1960s communications satellites eliminated the necessity of landlines. Today, bundles of glass fibers carry calls on laser beams of light.

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Its really very great and informative post. thanks for sharing the information.

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03/30/2011 18:45

It's a nice post!Thanks for your good work,it helps me a lot!I will come back again!very great and informative post. thanks for sharing

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08/08/2011 23:30

it helps me a lot!I will come back again!very great and informative post.

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