| 摘要 |
A stairway-evacuator contains bowstrings, hinging hooks, studs, rails, cross-beams, an arched enclosure. It is represented in the form of a welded three-dimensional lattice system consisting of two bowstrings, with the openings in the shelves for positioning the bolts, post-pipe, arched enclosures fastened with it by welding, cross-beams, detachable crossbar for forming the passage into the middle of steps, corner-anchor equipped with cuts.
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