ladders and stepladders [2]
Movable devices of wood or metal, composed of rungs or steps and used to reach relatively high areas.
fruit-picking ladder 
Double ladder specially designed for picking fruit and for pruning and maintaining trees.
rolling ladder 
Movable ladder fitted with a platform and a safety rail; it can be moved on wheels equipped with blocking devices.
ladder scaffold 
Movable structure made up of two vertical ladders and a work platform as well as wheels fitted with blocking devices.
multipurpose ladder 
Ladder with several folds, which can be locked in a number of positions.