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  2. Sash window - Wikipedia

    en.wikipedia.org/wiki/Sash_window

    The term "sash windows" is used interchangeably with the term "box sash windows" in the United Kingdom, and frequently used to describe the same thing. Historically box sash windows are heavier and more stately in nature than modern sash windows, but both terms are used within the industry when referring to the same type of window. [citation ...

  3. United States security clearance - Wikipedia

    en.wikipedia.org/wiki/United_States_security...

    Top Secret is a more stringent clearance. A Top Secret, or "TS", clearance, is often given as the result of a Single Scope Background Investigation , or SSBI. Top Secret clearances, in general, afford one access to data that affects national security , counterterrorism / counterintelligence , or other highly sensitive data.

  4. Talk:Sash window - Wikipedia

    en.wikipedia.org/wiki/Talk:Sash_window

    Today’s softwood windows use much cheaper, faster growing varieties of pine such as Redwood because Douglas-Fir is now more expensive than many hardwoods. The use of this timber in part explains the longevity of sash windows over modern casements. Another major factor that increased the life span of sash windows over casements is in the design.

  5. Classified information in the United States - Wikipedia

    en.wikipedia.org/wiki/Classified_information_in...

    The United States has three levels of classification: Confidential, Secret, and Top Secret. Each level of classification indicates an increasing degree of sensitivity. Thus, if one holds a Top Secret security clearance, one is allowed to handle information up to the level of Top Secret, including Secret and Confidential information. If one ...

  6. Classified information - Wikipedia

    en.wikipedia.org/wiki/Classified_information

    Top Secret is the highest level of classified information. [4] Information is further compartmented so that specific access using a code word after top secret is a legal way to hide collective and important information. [5] Such material would cause "exceptionally grave damage" to national security if made publicly available. [6] Prior to 1942 ...

  7. Government Security Classifications Policy - Wikipedia

    en.wikipedia.org/wiki/Government_Security...

    The GSCP uses three levels of classification: OFFICIAL, SECRET and TOP SECRET. [2] This is simpler than the old model and there is no direct relationship between the old and new classifications. "Unclassified" is deliberately omitted from the new model.

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