310011 Seats, primarily with metal frames

31001155 Upholstered swivel seats with variable height adjustment, with backrest and fitted with castors or glides excluding medical, surgical, dental or veterinary seats - barbers' or similar chairs 31001159 Non-upholstered swivel seats with variable height adjustment (excluding seats with castors or glides, medical, surgical, dental or veterinary seats, barbers' or similar chairs) 31001170 Upholstered seats with metal frames (excluding swivel seats, medical, surgical, dental or veterinary seats, barbers' or similar chairs, for motor vehicles, for aircraft) 31001190 Non-upholstered seats with metal frames (excluding medical, surgical, dental or veterinary seats, barbers' or similar chairs, swivel seats)