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Orenstein & Koppel (normally abbreviated to "O&K"), is a major German engineering company, and was founded on April 1, 1876 in Berlin by Benno Orenstein and Arthur Koppel.
Originally a general engineering company, O&K soon started to specialise in the manufacture of railway vehicles. The company's other specialisms included construction machinery and escalators.
O&K pulled out of the railway business in 1981, and sold its escalator manufacturing division to the Kone Corporation of Finland in 1996, leaving the company to focus primarily on construction machines.
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