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The Czech koruna is the currency of the Czech Republic since 1993. It is one of the EU currencies and has a history of monetary reforms, exchange rate fluctuations and euro adoption debate.
Wikipedia is a multilingual online encyclopedia that covers various topics, from history and science to culture and arts. You can browse articles, contribute to the community, or learn more about Wikipedia's history, projects, and policies.
The Krugerrand is a South African gold coin minted since 1967, with a mass of 33.93 g (1.09 troy oz) and a composition of 91.67% gold and 8.33% copper. Learn about its design, variations, imitations, and role in the global gold market.
Emerald is a green colored gemstone and a variety of the mineral beryl, with a hardness of 7.5–8 on the Mohs scale. Learn about its properties, color, clarity, cut, treatments, and history from this comprehensive article.
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Learn about the origins, features and uses of gold coins, from ancient times to modern bullion and commemorative coins. Find out how to identify, weigh and balance gold coins and how to avoid counterfeits.
QR code is a type of two-dimensional barcode invented in 1994 by a Japanese company for labelling automobile parts. It can store data for various purposes, such as web tracking, product identification, and mobile tagging, and can be scanned by imaging devices like cameras.
A SIM card is a smart card that stores an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile devices. The ICCID (integrated circuit card identification) is a unique serial number that identifies the SIM card itself.