[Class : 40] 3 D Printing; 3 D Printing Of Medical Instruments And Apparatuses; 3 D Printing Of Medical Apparatus Specific To Patient Spinal And Bone Structure; 3 D Printing Of Patient Specific Bone Models; 3 D Printing Of Patient Specific Medical Navigation Tools For Placing Screws Along A Chosen Trajectory On A Medical Patient.[Class : 42] Product Design, Engineering, Deve...