... CE certificate 2. Used in household,office building,parking lots etc 3. Columns can be shared more ... uses N+1 type,strongly interchange character,more parking space,more economical.Multi-stage cylinder behinder of the ... need to press the NO.of the empty space.Columns can be shared ,more economic and steadyDual ... ODM Accepted , OEM AcceptedSafety/Quality Approvals EPO hydraulic double car parking lift