Please answer the following question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Hydromash - Hydromash Joint-stock company is a large Russian firm involved in the design development manufacture and customer support of undercarriage and hydraulic units for aircraft landing gear systems. The company is based in Nijni-Novgorod and designs hydraulic actuators for both civil and military aircraft and helicopters. It established fruitful cooperation with leading Western companies working in this field such as Liebherr Group of Germany and Messier-Dowty of France.
A:
Company