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Priority to JP13925272UpriorityCriticalpatent/JPS4994931U/ja
Publication of JPS4994931UpublicationCriticalpatent/JPS4994931U/ja
E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
E06C—LADDERS
E06C1/00—Ladders in general
E06C1/02—Ladders in general with rigid longitudinal member or members
E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
E06C1/383—Foldable ladders in which the longitudinal members are brought together on folding