A chair lift including scissors pivotally mounted to a carriage and a lifting device pivotally positioned within the carriage. In a preferred embodiment, the invention relates to a method for regenerating filters employed to remove particulate matter from coker gas oil to improve coker gas oil yield and yield of upgraded coker gas oil products. The token manager may be configured with a parent digital certificate that is associated with the token manager. Each nozzle arrangement also includes an inlet defined in the substrate to supply the fluid chamber with printing fluid, and at least one heater element having a mass of less than 10 nanograms suspended between the side walls in the fluid chamber. These methods may also include positioning the medical device in a location proximate to a downstream surface of the heart valve and securing the device. For example, the rolls can be used as charge donor rolls in electrostatographic imaging apparatus.