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In architecture, a keystone is the stone at the top of an arch. It the supporting element for the entire arch— without it the arch would collapse.

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Topics: Keystone (architecture), Keystone Kops, Keystone Colorado...

Keystone KopsThe Keystone Kops was a series of silent film comedies featuring an incompetent group of policemen produced by Mack Sennett for his Keystone Film Company between 1912 and 1917. The idea came from Hank Mann, who also played police chief Tehiezel in the fir	Keystone, ColoradoKeystone is a census-designated place located in Summit County, Colorado. As of the 2000 census, the CDP had a total population of 825. Keystone is most famous for the Keystone Resort ski area. Originally constructed in the 1970s by the Ralston-Purina Com	Keystone Heights, FloridaKeystone Heights is a city located in Clay County, Florida. As of the 2000 census, the city had a total population of 1,349. Named after the state of Pennsylvania, the "Keystone State". History Founded by Pennsylvanians who named it after there home state
Keystone, FloridaKeystone is an unincorporated census-designated place located in Hillsborough County, Florida. As of the 2000 census, the community had a total population of 14,627. Geography Keystone is located at 28°7'39" North, 82°35'21" West (28. 127550, -82. Accordi	Keystone, IowaKeystone is a city located in Benton County, Iowa. As of the 2000 census, the city had a total population of 687. Geography Keystone is located at 42°0'3" North, 92°11'55" West (42. 000915, -92. According to the United States Census Bureau, the city has a	Keystone Township, MinnesotaKeystone Township is a township located in Polk County, Minnesota. As of the 2000 census, the township had a total population of 100. Geography According to the United States Census Bureau, the township has a total area of 92. 6 mi²) of it is land and non
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Keystone (architecture)	Keystone (train)	Keystone National High School