Bleacher seating with HBYC-19 Telescopic stand, Stadium seating one of suppliers ... 2008 Olympic Games ISO9001:2000 Bleacher seating with HBYC-19, telescopic stand, stadium seatingPassed through ISO9001:2000We are ... 50HZ, gear ratio 1:59,speed 1400 r / min.The average active loading: 500kg/sq.mThe static loading when ... : 0086-21-37793757 Bleacher seating with HBYC-19, telescopic stand, stadium seating