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