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Casinghead for deep-drilling wells producing and/or pressing-in hydrocarbon, carbon dioxide and thermal energy
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Method for slag welding and slag welding apparatus
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Impulse supplement unit for pulse d.c. arc welding of pulse operation
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Helical strip welded pipe making machine - with alignment monitored pipe forming rollers ensuring automatic calibration of pipe
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Facility for making the welded tubes with spiral welding seam from the steel bands or metal sheets
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Device for producing spiral tubes from steel strip or steel plate
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Helical strip welded pipe making machine - with alignment monitored pipe forming rollers ensuring automatic calibration of pipe
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Apparatus for producing helical seam pipes
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Apparatus for forming tubes of spiral seam from strip steel resp. steel plate
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