Figure 6-3-4 Mistake-Proofing the Design of Health Care Processes - Figure 6.3. Exiting a wheelchair with automatic brakes Source: Photo courtesy of Safer Automatic Wheelchair Wheel Lock, Inc. Used with permission.Return to DocumentFigure 6.4. A riding mower with an electronic sensor and "dead-man's switch" Return to Document Current as of May 2007 Internet Citation: Figure 6-3-4: Mistake-Proofing the Design of Health Care Processes -. May 2007. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/professionals/quality-patient-safety/patient-safety-resources/resources/mistakeproof/mistakefig6-3-4.html