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5.1 Staircase on metal structure 5.2 Staircase of module stair treads 5.3 Winding stairs I 5.4 Winding stairs II 5.5 Staircase on concrete structure I 5.6 Winding stairs III 5.7 Staircase on concrete structure II 5.8 Winding stairs IV Stair tread slabs of customized dimensions |
 5.5 An open structure may also be made of concrete instead of metal
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