Collapsible Ladder 1 : A single ladder with rungs that can be folded so that the side rails touch each other, or nearly touch each other, for easy storage or transport. See: Attic Ladder, Closet Ladder
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}