Each of the damper portions is configured to generate friction torque in such a manner that a plurality of swing friction plates configured to swing in {HEAD ~ accordance} with {TAIL ~ the operating portion} is pressed by a pressing spring in a direction perpendicular to a swing direction of the operating portion against a plurality of fixed friction plates configured to be prevented from swinging 
Each of the damper portions is configured to generate friction torque in such a manner that a plurality of swing friction plates configured to swing in { HEAD ~ accordance } with { TAIL ~ the operating portion } is pressed by a pressing spring in a direction perpendicular to a swing direction of the operating portion against a plurality of fixed friction plates configured to be prevented from swinging
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH