This type of ladder is popular in Europe, but it’s more common to find A-frames that are telescopic in the U.S. While they can be used like a step-ladder, they also can be extended straight up ...

There are also fixed ladders that are used on the sides of boats or on some Lorries. John H_ Basely of Dayton invented the step ladder in 1862. When he made it he put hinges on it so when someone ...