What industry does the hydrogen-oxygen machine belong to?

Medical machinery industry. Hydrogen-oxygen machine is a kind of equipment that can separate water into hydrogen and oxygen. It is often used in hospitals, clinics, nursing homes and other medical institutions to provide medical oxygen and hydrogen, so it belongs to the medical machinery industry. In hydrogen-oxygen machine, oxygen is a commonly used medical gas, which can be used to treat many diseases, such as obstructive pulmonary disease, tracheitis, pneumonia, emphysema and so on. On the other hand, hydrogen is considered as a kind of molecular gas that helps to alleviate inflammation and oxidative stress damage, and it has been widely used in the medical field in recent years.