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  2. Numismatic Guaranty Company - Wikipedia

    en.wikipedia.org/wiki/Numismatic_Guaranty_Company

    Numismatic Guaranty Company (NGC) is an international third-party coin grading and certification service based in Sarasota, Florida. It has certified more than 60 million coins. NGC certification consists of authentication, grading, attribution, and encapsulation in clear plastic holders.

  3. List of North American Numbering Plan area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_North_American...

    Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.

  4. List of Massachusetts Bay Transportation Authority yards

    en.wikipedia.org/wiki/List_of_Massachusetts_Bay...

    North Station Yard at North Station: Green Line: layover and storage Orient Heights Yard east of Orient Heights: Blue Line: maintenance and storage Reservoir Yard between Reservoir and Cleveland Circle: Green Line (C branch and D branch) maintenance and storage Riverside Yard at Riverside: Green Line maintenance and storage Wellington Yard

  5. Lists of North American area codes - Wikipedia

    en.wikipedia.org/wiki/Lists_of_North_American...

    Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union. Original North American area codes; List of North American Numbering Plan area codes; Telephone numbers in Mexico; Telephone numbers in Greenland

  6. Professional Coin Grading Service - Wikipedia

    en.wikipedia.org/wiki/Professional_Coin_Grading...

    A comprehensive survey of major coin dealers, carried out in collaboration with the Professional Numismatists Guild (PNG) and the Industry Council For Tangible Assets (ICTA), disclosed that PCGS received the dealers' top-tier "Superior" rating, which was the highest rating granted to any service. Among the other 10 grading services scrutinized ...

  7. Area codes 214, 469, 972, and 945 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_214,_469,_972...

    Area code 469 was introduced on July 1, 1999, in an overlay plan for most of the eastern portion of the Metroplex. At the same time, the 214/972 boundary was "erased," and 972 was converted into an additional overlay for the entire region. The result was three area codes overlaying the same area, with ten-digit dialing required for all calls.

  8. Grading (earthworks) - Wikipedia

    en.wikipedia.org/wiki/Grading_(earthworks)

    Section through railway track and foundation showing the sub-grade. Grading in civil engineering and landscape architectural construction is the work of ensuring a level base, or one with a specified slope, [1] for a construction work such as a foundation, the base course for a road or a railway, or landscape and garden improvements, or surface drainage.

  9. ANACS (coin grading company) - Wikipedia

    en.wikipedia.org/wiki/ANACS_(coin_grading_company)

    Originally founded in June 1972 as the American Numismatic Association's authentication service, ANACS expanded into third-party coin grading in March 1979. ANACS was founded in response to the rise in counterfeit and altered coins in the numismatic marketplace. During the coin collecting boom of the 1960s, counterfeiters would alter common ...

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