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  2. Ritchie Street - Wikipedia

    en.wikipedia.org/wiki/Ritchie_Street

    Ritchie street started as a radio market and then transformed into a market for televisions, computers, mobile phones and laptops. Today, the street has over 2,500 shops employing 15,000 people. [1] Ritchie Street is credited as the second largest electronic market for computer spares and peripherals in India, after Nehru Place, New Delhi ...

  3. Martin Cooper (inventor) - Wikipedia

    en.wikipedia.org/wiki/Martin_Cooper_(inventor)

    Martin Cooper (inventor) Martin Cooper (born December 26, 1928) is an American engineer. He is a pioneer in the wireless communications industry, especially in radio spectrum management, with eleven patents in the field. [2][3] On April 3, 1973, he placed the first public call from a handheld portable cell phone while working at Motorola, from ...

  4. History of mobile phones - Wikipedia

    en.wikipedia.org/wiki/History_of_mobile_phones

    History of mobile phones. A man talks on his mobile phone while standing near a conventional telephone box, which stands empty. Enabling technology for mobile phones was first developed in the 1940s but it was not until the mid-1980s that they became widely available. By 2011, it was estimated in Britain that more calls were made using mobile ...

  5. Mobile phone - Wikipedia

    en.wikipedia.org/wiki/Mobile_phone

    A mobile phone or cell phone[a] is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area, as opposed to a fixed-location phone (landline phone). The radio frequency link establishes a connection to the switching systems of a mobile phone operator, which provides ...

  6. Fort Pitt Tunnel - Wikipedia

    en.wikipedia.org/wiki/Fort_Pitt_Tunnel

    The Fort Pitt Tunnel is a vehicular tunnel under Mount Washington in Pittsburgh, Pennsylvania. It connects the West End region on the southwest side to the South Shore neighborhood on the northeast side. The adjoining Fort Pitt Bridge on the northeast end connects to Downtown Pittsburgh. The tunnel carries traffic on Interstate 376 (I-376), [a ...

  7. Bell Laboratories Building - Wikipedia

    en.wikipedia.org/wiki/Bell_Laboratories_Building

    May 15, 1975 [2] 463 West Street is a 13-building complex located on the block between West Street, Washington Street, Bank Street, and Bethune Street in Manhattan, New York. It was originally the home of Bell Telephone Laboratories between 1898 and 1966. For a time, it was the largest industrial research center in the United States.

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