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Figure 9. Material testing system-measured modulus of dynamic stiffness for all preload forces of seven seating systems.
 
                
                
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Figure 9. Material testing system-measured modulus of dynamic stiffness for all preload forces of seven seating systems. Garcia-Mendez Y, Pearlman JL, Cooper RA, Boninger ML. Dynamic stiffness and transmissibility of commercially available wheelchair cushions using a laboratory test method. J Rehabil Res Dev. 2012;49(1):7–22.http://dx.doi.org/10.1682/JRRD.2011.02.0023