* Conventional hydraulic elevators. They use an underground cylinder, are quite common for low level buildings with 2-7 floors, and have speeds of up to 200 feet/minute (1 meter/second).
    * Holeless hydraulic elevators were developed in the 1970s, and use a pair of above ground cylinders, which makes it practical for environmentally or cost sensitive buildings with 2, 3, or 4 floors.
    * Roped hydraulic elevators use both above ground cylinders and a rope system, which combines the versatility of inground hydraulic with the reliability of holeless hydraulic, even though they can serve up to 8-10 floors.