Опубликовано в "Бизнес", язык - English. 7 страниц.
A vertical transportation for raising and lowering people or things to different levels in a modernized building is an elevator. There are three types of elevators traction, hydraulic and machine room less elevators. Elevator maintenance is about updating old components with the new components, before changing the old components these are checked by exports and then replaced with the new components by this process the performance of the elevators increases and even the safety also improved. Еще
