due to out of date information . please update this article to reflect recent events or newly available information . april 2014 demag cranes ag industry engineering and service founded 1910 headquarters d sseldorf germany products bridge cranes hoists material handling equipment gantry cranes and port technology . number of employees 5 893 reported 5 4 11 website www.demagcranes ag.de demag cranes ag is a german heavy equipment manufacturer now controlled by us based terex . the roots of demag date back prior to its formation but became m rkische maschinenbau anstalt ludwig a. g in 1906 as the biggest crane building company in germany employing 250 300 people . the company was a manufacturer of industrial cranes that included types like bridge cranes hoist device overhead cranes gantry crane to name a few . in 1910 came the hour of the deutsche maschinenfabrik in duisburg known worldwide by its telegram abbreviation demag now demag cranes & components gmbh . 1 in 1973 the mannesmann group assumed ownership of demag . since that time the company has continued to grow and change . parts of the company under core business structuring moved from its ownership to focus the main concept of the company . contents 1 founding 2 hydraulic era 3 as part of the mannesmann group 4 notable dates . 5 gallery 6 references 7 external links founding edit the demag company was formed finally 1910 in duisburg through the union of the m rkische maschinenbau anstalt l. stuckenholz ag the duisburg mechanical engineering ag and the benrath machine works gmbh . the m rkische maschinenbau anstalt l. stuckenholz ag traces back to the machine factory mechanische werkst tten harkort & co. founded 1819 in wetter an der ruhr already beginning the manufacturing of cranes in 1840 . in 1908 they designed what was then the world s largest floating crane built for harland & wolff in belfast which would be used for the building of the passenger liners rms olympic and rms titanic . 2 starting in 1925 demag also manufactured excavators . they expanded to manufacture locomotives and railroad cars . during the second world war armoured fighting vehicles in particular bergepanther were built in the berlin staaken plant . during the buildup to and during world war ii demag designed halftrack military vehicles both in unarmored artillery tractor models in the late 1930s the basis for the powertrain of their armored sd.kfz . 250 which itself played an important role during the war with just over 6 600 built by demag and their subcontractors . hydraulic era edit in 1954 demag developed their first hydraulic excavators . demag would soon expand into construction machines vehicle cranes moving and conveying engineering workshop crane and control devices steel mill technology complete metallurgical plants in particular continuous casting equipment compressors and compressed air engineering . the company also became a world leader in the manufacturing of injection moulding machines . as part of the mannesmann group edit demag overhead crane and hoist device demag bridge crane . in 1973 the ownership of demag was assumed by the mannesmann group based in d sseldorf . in 1983 mannesmann demag ag and wean united inc. of pittsburgh united states founded a daughter company to produce steel working equipment mannesmann demag wean co. a joint venture with the japanese manufacturer komatsu led to spinning off of the large scale excavation operations and their renaming as komatsu mining . the steel and rolling mill technology division based in duisburg was spun off to schloemann siemag sms and continues today under the name sms demag . the compressor division was sold in 1996 to compair which was then part of the british siebe invensys group but has since become an independent company . later 1999 the injection moulding manufacturing was merged with that of krauss maffei which had itself been acquired by mannesmann from 1989 to form mannesmann demag krauss maffei and formed part of mannesmann atecs for advanced technologies a holding company for all of mannesmann s non telecom activities . krauss maffei s general equipment manufacturing and defence portions later passed to linke hoffmann busch . the holding company was later named mannesmann plastics machinery or mpm with primary divisions demag plastics and krauss maffei . crane built by demag in 1935 following the acquisition of mannesmann by vodafone in 1999 2000 the atecs holding company was divested to a consortium of siemens and bosch which then integrated parts of it into one or the other company and spun off others . the demag units became part of siemens . in the autumn of 2001 siemens divested by far the majority of these to kohlberg kravis roberts kkr . at this same time the world economy was going through another recession entailing downsizing and the reduction of jobs . those that remained were restructured and became part of the new company focus for future growth . demag cranes and components was one of the non core divisions carved out from siemens and acquired by kkr . kkr initiated a major reorganization of the demag crane and components organization including a refocused effort of their product lines . the production and general company focus changed to overhead cranes hoists gantry cranes and portal cranes under the name gottwald . parts of the conveying engineering activities remained with siemens under the name dematic . the remainder of the conveying engineering firm was sold in 2006 as demag cranes ag together with the quay crane manufacturer . demag cranes was listed publicly in 2006 and has since increased its market share both in the us and worldwide . mpm was also sold to kkr and is now part of sumitomo heavy industries in august 2002 the demag crane plant in zweibr cken became part of the us terex company . the brand name terex demag continues . in 2011 the bbc television programme how to build a super jumbo wing showed demag equipment at broughton flintshire wales uk lifting the largest wing ever produced for a civil airliner 17.7 metres from front to back and 36.3 metres from fuselage to wingtip . this is fitted to the airbus a380 the world s biggest passenger aircraft . notable dates . edit 1819 the present day demag cranes & components gmbh founded under the name mechanische werkst tten harkort & co. in wetter an der ruhr . first steam powered 1 crane produced by ludwig stuckenholz company . now demag cranes & components gmbh . 1840 demag cranes & components starts full production of overhead cranes in germany . 1906 the present day gottwald port technology gmbh founded under the name of maschinenfabrik ernst halbach ag in d sseldorf 1910 successor companies to mechanische werkst tten harkort & co. become part of deutsche maschinenfabrik ag demag demag starts production of electric motor hoist . 1956 leo gottwald kg builds the first mobile harbor crane 1969 demag introduces the first ac motor with a sliding rotor on its crane product in the usa . 1988 mannesmann takes over leo gottwald kg and integrates it in mannesmann demag ag 1992 restructuring of the mannesmann demag group and spin off of mannesmann demag f rdertechnik ag in wetter 1996 mannesmann demag f rdertechnik ag takes over the mobile cranes segment from mannesmann demag ag in duisburg . 1997 mannesmann demag f rdertechnik ag is renamed mannesmann dematic ag 2000 mannesmann dematic becomes an integral part of the atecs mannesmann ag group ; spin off of demag cranes & components gmbh wetter ; mannesmann taken over by vodafone ; siemens ag and robert bosch gmbh acquire atecs mannesmann ; the mechanical engineering division of atecs mannesmann ag to which the current segments of demag cranes belonged remains in the siemens group 2002 demag cranes & components gmbh and gottwald port technology gmbh taken over by demag holding s. r.l luxembourg in which private equity investment funds advised by kkr hold an 81 % interest and siemens ag holds 19 % interest 2005 demag crane & components corp. produces the first smart hoist with self diagnostic capability . 2006 consolidation of demag cranes & components gmbh and gottwald port technology gmbh under the umbrella of demag cranes ag and ipo and 23 june 2006 . withdrawal of demag holding s. . r.l. . 2010 demag becomes the first company to receive the industry certification by hmi . june 30 2011 terex gains 67 % of demag cranes . references 1 gallery edit example of steam powered overhead crane from 1875 produced by ludwig stuckenholz ag wetter an der ruhr germany . design developed by rudolf bredt from an original installation at crewe railway works 1 circa 2010 double girder top running demag bridge crane operated via radio control . radio control is often used when handling steel coils . demag sliding rotor motor concept with main motor and creep motor . this type of configuration was mostly used in hoists found on bridge cranes from 1925 in the n series hoist to present day . demag gantry crane of the north sea stations in emden germany author frisia orientalis . crane located in tsingtao china . giant crane supplied by demag . during the war a large blast destroyed the foundation dumping the crane in the sea where it remained for 5 years until the japanese brought it up again and repaired the systems completely . a demag crane suspended above a factory floor handling textile machines in a company called textima . photographs by roger and renate r ssing from 1951 circa 2010 demag overhead crane and hoist device being used in typical machine shop . the hoist is operated via a wired pushbutton station known as a pendant to move the system and the load in any direction references edit a b c kurrer karl eugen 2008 . the history of the theory of structures from arch analysis to computational mechanics . berlin ernst & sohn . pp. 429 430 . isbn 3 433 01838 3 . cite error invalid ref tag ; name kurrer2008 defined multiple times with different content see the help page . http 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