The development and application of a novel non-polar oil recovery process utilizing a non-dispersive solvent extraction method to coalesce and recover oil from a bio-cellular aqueous slurry is described herein. The lift as provided with a manual mechanism for unlocking the cradle from its uppermost storage position for operation when the hydraulic system is not available. In addition, as the coloring matter, a dyestuff that has the maximum absorption in the wavelength range of 550 to 600 nm or the like is employed. Target data for each memory cell is stored in a data cache associated with that particular memory cell.