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Keystone Keystone may refer to: * Keystone (architecture), a central stone or other piece at the apex of an arch or vault * The keystone effect, caused by projecting an image onto a surface at an angle, or by photography at an angle * Keystone (cask), a fitting used in ale casks * Keystone module, a type of data connector mounted in walls and patch panels * Keystone species, species that have a larger effect on their environment than is purely due to their abundance * Operation Keystone during World War II * The Keystone asterism in the Hercules constellation * Keystone Press Awards * Keystone (limestone), quarried in the Florida Keys * Keystone, a variety of screwdriver blade * Keystone Initiative, a medical protocol to reduce infection rates ==Business==
* Digital Keystone, Inc., a developer of digital entertainment software * Keystone Aircraft Corporation * Keystone Bridge Company, an American bridge building company * Keystone (beer brand) * Keystone Camera Company * Keystone (gasoline automobile) * Keystone (steam automobile) * Keystone Pipeline System, a crude oil pipeline * Keystone View Company, a US photo agency * Keystone (Berkeley, California), a defunct music club
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Keystone」の詳細全文を読む
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