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Marmon Group is an American industrial holding company headquartered in Chicago, Illinois.Founded by Jay Pritzker and Robert Pritzker in 1953 (as Colson Corporation), it has been held by the Berkshire Hathaway group since 2013.
Chicago Parking Meters LLC also known as ParkChicago [1] is an American company [2] with several investors [3] that owns the parking meters in the city of Chicago, Illinois. The company has gained notoriety for its roots in the sale of the City of Chicago's parking meters to private investors, considered a financial disaster for the city.
Motorola Solutions, Inc. is an American video equipment, telecommunications equipment, software, systems and services provider that succeeded Motorola, Inc., following the spinoff of the mobile phone division into Motorola Mobility in 2011. The company is headquartered in Chicago, Illinois. [2]
In number theory, a Descartes number is an odd number which would have been an odd perfect number if one of its composite factors were prime.They are named after René Descartes who observed that the number D = 3 2 ⋅7 2 ⋅11 2 ⋅13 2 ⋅22021 = (3⋅1001) 2 ⋅ (22⋅1001 − 1) = 198585576189 would be an odd perfect number if only 22021 were a prime number, since the sum-of-divisors ...
Andreas Cellarius's illustration of the Copernican system, from the Harmonia Macrocosmica. Heliocentrism [a] (also known as the heliocentric model) is a superseded astronomical model in which the Earth and planets revolve around the Sun at the center of the universe.
As defined by the federal government, the Chicago metro area includes several counties in Illinois, Indiana, and Wisconsin, and has a population of over 9.8 million. Chicago itself is a cosmopolitan city, densely populated, industrialized, the transportation hub of the nation, and settled by a wide variety of ethnic groups.
Keith A. Bentley and Barry J. Bentley founded Bentley Systems in 1984. [6] They introduced the commercial version of PseudoStation in 1985, which allowed users of Intergraph's VAX systems to use low-cost graphics terminals to view and modify the designs on their Intergraph IGDS (Interactive Graphics Design System) installations. [7]
CB&I was founded in 1889 by Horace E. Horton in Chicago, Illinois, USA.While initially involved in bridge design and construction, CB&I turned its focus to bulk liquid storage in the late 19th and early 20th centuries, coinciding with the western expansion of railroads across the United States and the discovery of oil in the Southwest.