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  2. Toll-free telephone numbers in the North American Numbering ...

    en.wikipedia.org/wiki/Toll-free_telephone...

    Toll-free telephone numbers in the North American Numbering Plan. Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing ...

  3. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    Calling an 800-number is free of charge. Calling a 400-number incurs a local access charge. 800-numbers are accessible only to land-line subscribers, while 400-numbers are accessible to all land-line and mobile users. 800-toll-free numbers. 800 toll-free numbers are commonly called "800 免费电话".

  4. Comparison of ICBMs - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_ICBMs

    800 kt Active 1985 No Road-mobile TEL: 200–900 m 6 RT-2PM2 Topol-M: Russia: Votkinsk Machine Building Plant 11,000 km 47,200 kg 800 kt Active 1994 No Silo, road-mobile TEL 200 m 7 RS-24: Russia Votkinsk Machine Building Plant 12,000 km 49,000 kg 3-4 x 300 kt Active 2007 Yes Silo, road-mobile TEL 150 m 8 R-29R: Russia State Rocket Center Makeyev

  5. National conventions for writing telephone numbers - Wikipedia

    en.wikipedia.org/wiki/National_conventions_for...

    Cellphone numbers are assigned the 1-digit area code 6, leaving eight digits for the subscriber's number: 06-CBBBBBBB, where subscriber's number ('C') is neither 6 nor 7. Service numbers (area codes 800, 900, 906 and 909) have either 4 or 7 remaining digits, making them 8 or 11 digits in total: 0AAA-BBBB or 0AAA-BBBBBBB. The area code 14 has no ...

  6. Hardness comparison - Wikipedia

    en.wikipedia.org/wiki/Hardness_comparison

    Hardness comparison table. Brinell HB. (10 mm Ball, 3000 kg load) Vickers HV. (5 kg) Rockwell C HRC. (120 degree cone 150 kg) Rockwell B HRB. (1/16" ball 100 kg)

  7. 800 (number) - Wikipedia

    en.wikipedia.org/wiki/800_(number)

    800 (number) 800 ( eight hundred) is the natural number following 799 and preceding 801 . It is the sum of four consecutive primes (193 + 197 + 199 + 211). It is a Harshad number, an Achilles number and the area of a square with diagonal 40. [1]

  8. List of common display resolutions - Wikipedia

    en.wikipedia.org/wiki/List_of_common_display...

    16:9. 8,294,400. 7680 × 4320. 8K UHDTV. 4320p. 33,177,600. Many of these resolutions are also used for video files that are not broadcast. These may also use other aspect ratios by cropping otherwise black bars at the top and bottom which result from cinema aspect ratios greater than 16∶9, such as 1.85 or 2.35 through 2.40 (dubbed ...

  9. GOOG-411 - Wikipedia

    en.wikipedia.org/wiki/GOOG-411

    GOOG-411. GOOG-411 (or Google Voice Local Search) was a telephone service launched by Google in 2007, that provided a speech-recognition -based business directory search, and placed a call to the resulting number in the United States or Canada. [1] The service was accessible a toll-free telephone number.

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