(a) This part sets forth the classification of hematology and pathology devices intended for human use that are in commercial distribution.(b) The identification of a device in a regulation in this part is not a precise description of every device that is, or will be, subject to the regulation. A manufacturer who submits a premarket notification submission for a device under part 807 may not show merely that the device is accurately described by the section title and identification provisions of a regulation in this part, but shall state why the device is substantially equivalent to other devices, as required by § 807.87 .(c) References in this part to regulatory sections of the Code of Federal Regulations are to chapter I of title 21, unless otherwise noted.52 FR 17732, May 11, 1987, as amended at 69 FR 12273 , Mar. 16, 2004; 78 FR 18233 , Mar. 26, 2013; 79 FR 50552 , Aug. 25, 2014