Implantable medical devices, namely, bone plates, bone screws, and interbody cages; Medical apparatus for use in spinal surgeries; Surgical apparatus; Surgical implants comprising artificial materials; Spinal implants composed of artificial material; Spinal devices, namely, bone plates, bone screws, and interbody cages; Medical devices, namely, spinal plates for use in surgery; Bone implants composed of artificial material

solid state, non-scanning gauge for measuring any one of thickness, density and denier of a material to control the extrusion of a film and for correcting erroneous measurement caused by web flutter