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  2. Radio-frequency identification - Wikipedia

    en.wikipedia.org/wiki/Radio-frequency_identification

    ISO-compatible microprocessor cards (Desfire EV1, Seos) US$0.05 to US$5 UHF: 433 MHz Short range devices 1–100 m (3–300 ft) Moderate Part 7: Defense applications, Underground Miner Tracking with active tags US$5 UHF: 865–868 MHz (Europe) 902–928 MHz (North America) ISM band 1–12 m (3–40 ft) Moderate to high Part 6

  3. Debit card - Wikipedia

    en.wikipedia.org/wiki/Debit_card

    A debit card, also known as a check card or bank card, is a payment card that can be used in place of cash to make purchases. The card usually consists of the bank's name, a card number, the cardholder's name, and an expiration date, on either the front or the back. Many new cards now have a chip on them, which allows people to use their card ...

  4. Contactless payment - Wikipedia

    en.wikipedia.org/wiki/Contactless_payment

    Contactless payment systems are credit cards and debit cards, key fobs, smart cards, or other devices, including smartphones and other mobile devices, that use radio-frequency identification (RFID) or near-field communication (NFC) for making secure payments. The embedded integrated circuit chip and antenna enable consumers to wave their card ...

  5. MiniDisc - Wikipedia

    en.wikipedia.org/wiki/MiniDisc

    MiniDisc ( MD) is an erasable magneto-optical disc-based data storage format offering a capacity of 60, 74, and later, 80 minutes of digitized audio . Sony announced the MiniDisc in September 1992 and released it in November [2] of that year for sale in Japan and in December in Europe, North America, and other countries. [3]

  6. Large denominations of United States currency - Wikipedia

    en.wikipedia.org/wiki/Large_denominations_of...

    According to the U.S. Department of Treasury website, "The present denominations of our currency in production are $1, $2, $5, $10, $20, $50 and $100. The purpose of the United States currency system is to serve the needs of the public and these denominations meet that goal. Neither the Department of the Treasury nor the Federal Reserve System ...

  7. List of largest companies by revenue - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_companies...

    American retail corporation Walmart has been the world's largest company by revenue since 2014. [ 1] The list is limited to the largest 50 companies, all of which have annual revenues exceeding US$130 billion. This list is incomplete, as not all companies disclose their information to the media or general public. [ 3]

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