Office chairs used in manufacturing administrative and management departments. Chairs emphasizing comfort and durability for long desk work in factory offices, quality control rooms, design departments, and production management offices. Ergonomic design supports concentrated work such as CAD operations, production planning, and quality data analysis. Includes swivel chairs with casters, fixed-leg chairs, conference chairs, and executive chairs. Distinguished from work chairs for manufacturing floors and standing work chairs in factories, dedicated exclusively for office administrative work.