OTIS ReGen drive Davor Okrožnik منتشر شده در تاریخ 1388/08/14 Regenerative elevator drive, that feeds the electricity back to the building grid! Otis rules! ... Regenerative elevator drive, that feeds the electricity back to the building grid! Otis rules! همه توضیحات ... #science_technology #regenerative_drive #otis #elevator