has been engineering
-ha estado maquinando
Present perfect progressivehe/sheconjugation ofengineer.

engineer

LOSMA has been engineering and manufacturing systems for the treatment of air and the filtration of coolants since 1974.
LOSMA projecta y produce sistemas para el tratamiento del aire y de filtración de líquidos refrigeradores desde 1974.
For more than 45 years Vactor has been engineering and manufacturing quality products for sewer cleaning, line jetting, vacuum excavating and glycol recovery.
Durante más de 45 años, Vactor ha diseñado y fabricado productos de calidad para la limpieza de alcantarillas, limpieza a presión, excavación al vacío y recuperación de glicol.
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