school library bookshelf reading room single double-sided bookshelf file shelf bookstore steel multi-layer floor shelf

[upgrade] main frame 5-storey height 180 * width 60 * depth 30 [upgrade] main frame 5-storey height 180 * width 80 * depth 30 [upgrade] main frame 5-storey height 180 * width 100 * depth 30 [upgrade] main frame 5-storey height 180 * width 120 * depth 30 [upgraded] 5-storey sub-frame height 180 * width 50 * depth 30 [upgraded] 5-storey sub-frame height 180 * width 70 * depth 30 [upgraded] 5-storey sub-frame height 180 * width 90 * depth 30 [upgraded] 5-storey sub-frame height 180 * width 110 * depth 30 [upgrade] main frame 6-storey height 200 * width 60 * depth 30 [upgrade] main frame 6-storey height 200 * width 80 * depth 30 [upgrade] main frame 6-storey height 200 * width 100 * depth 30 [upgrade] main frame 6-storey height 200 * width 120 * depth 30 [upgraded] 6-layer high 200 * width 50 * depth 30 [upgraded] 6-storey shelf height 200 * width 70 * depth 30 [upgraded] 6-storey shelf height 200 * width 90 * depth 30 upgraded model] 6-layer shelf height 200 * width 110 * depth 30

[upgrade thickened]]