Containers for storage and temporary holding of liquids, gases, and powders in manufacturing industries. Includes various storage equipment integrated into production processes such as raw material tanks, intermediate storage vessels, product tanks, reaction vessels, and mixing tanks. Materials include stainless steel, carbon steel, FRP, etc., selected according to capacity, pressure, and temperature conditions. Includes specialized types with agitation functions or heating/cooling capabilities. Also covers accessories such as nozzles for piping connections, manholes, and liquid level gauge mounting seats. Covers a wide range from simple containers to complex reactors, clearly distinguished from fluid equipment such as pumps and valves.