A single letter or numeral designed for use in marking a sheet of x-ray film for identification at the time of exposure.
NSN 5945-01-583-6521
NSN 5895-01-517-3643
NSN 5985-00-778-2888
NSN 6150-00-295-5714
NSN 5975-01-025-5794
NSN 6620-01-327-3011
NSN 5998-01-193-8940
NSN 4140-00-529-0844
NSN 6645-00-130-8464
NSN 5975-01-381-3218
NSN 5925-01-111-9950
NSN 5945-00-874-7948