| 摘要 |
a stowage framework adapted to be anchored in an opening formed in the slab of the floor, veranda or the like of said building; upper and lower covers pivoted to the floor surface side and ceiling surface side of said frame-work, respectively; linkage means pivoted to said upper and lower covers and holding said upper cover substantially uprightly when the cover is opened; telescopically extensible escape means comprising a plurality of telescopically connected pipe sections of different cross-sections areas which decrease downwardly; descent control means for initiating descent speed of the escape means.
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