A single letter or numeral designed for use in marking a sheet of x-ray film for identification at the time of exposure.
NSN 6110-01-059-7276
NSN 6650-01-517-9452
NSN 5910-01-195-2213
NSN 6110-00-383-5367
NSN 5960-01-019-4920
NSN 6240-00-660-8849
NSN 5996-00-283-3710
NSN 5920-00-189-0858
NSN 5990-00-152-3929
NSN 7035-01-448-4740
NSN 6145-00-158-8704
NSN 5920-01-059-0894