Hardened case for the slit light ophthalmic end item nsn 6540-01-520-7942. Found in army assemblage n315, medical materiel set eye exam clinic: depmeds
NSN 5930-01-155-3124
NSN 6650-01-013-3243
NSN 6610-01-593-4643
NSN 5965-01-106-1431
NSN 5920-01-433-9119
NSN 5975-00-021-4519
NSN 6685-00-447-5087
NSN 4140-01-564-7840
NSN 6220-00-686-5328
NSN 6610-01-152-2821
NSN 6610-00-078-9620
NSN 5835-00-759-1109