History
The word telephone, from the Greek roots tele, far, and phone, sound, was applied as early as the late 17th century to the string telephone familiar to children and was later used to refer to the megaphone and the speaking tube; but in modern usage it refers solely to electrical devices derived from the inventions of Alexander Graham Bell and others. The U.S. patent granted to Bell in March 1876 for the development of a device to transmit speech sounds over electric wires is often said to be the most valuable ever issued. The gen..............etc

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i need a power point presentation on ocb switching(bsnl)..............etc

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ukggihujj;iokk ojouimm,h ;h;jiojkkplolol ..............etc

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dear sir/mam, i m electronics studentof 4th yr. plz provide me BSNL summer training report and ppt as soon as possible. it is very urgent. for this i shall be highly obliged to you...............etc

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I am a final year student and i did my industrial training in c-dot exchange in bsnl. so i request you to please help me download this ppt with good content..............etc

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I am looking for presentation in cdot exchange. I am in final year and i took two months training in bsnl in cdot exchange after the complrtion of my preginal year. so please help me download this ppt
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