Телескопические лестницы-стремянки

Telescopic ladders, also known as retractable ladders, are short ladders which can be extended and collapsed back down. They use telescopic sides which consist of tubes that slide into one another. Once collapsed, telescopic ladders are much smaller and easier to store or transport. Transporting the ladder is easy as it can be collapsed to about a third of the maximum size. Telescopic ladd...