The family-owned company has a 40 year history rooted in a small engineering company specializing in the design of small machines and tools founded by Karl-Heinz Krah in 1968 in Westerwald. Over time the company has developed from a small workshop and "one man show" to a worldwide manufacturer of specialized machines in pipe production plants for big diameters of non pressure plastic pipes, as well as plastic pressure pipes. The company is still family-managed currently by Alexander Krah, the youngest son of Karl-Heinz Krah. The company has production facilities in Spain, Croatia, Germany, Argentina, USA, Kuwait, Oman and Mexico. In 2007 an Arab investor injected money in cash for a 50% share in the company. The remaining shares are held equally by Karl-Heinz Krah and Alexander Krah.
In 2008 the Krah pipe manufacturer (Krah Pipe Systems)in Greenwood/USA set up the world's first plant for large diameter helical extrusion pipes, ranging up to 120 inches (3,048 mm) for municipal water.
- "First Look: New Pressure Pipe Uses Electro-Fusion Joints". Retrieved 2009-04-30.
- "Auf Einkaufstour : Araber greifen nach "made in Germany"" (in German). Das Erste. 2009-04-29.
- "The founder and principal shareholder of Krah AG, Dipl.-Ing. Karl-Heinz Krah, has sold 50% of the company shares to a currently unknown investment trust. Extensive investments, reorganizations and other changes are to be expected. 25% of the shares remain in possession of Dipl.-Kfm. Alexander Krah". Archived from the original on June 16, 2008. Retrieved 2009-05-05.
- "First Large-Diameter Pressure Pipe for Water—January 2008". Retrieved 2009-04-30.
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