Optical Blocks

2 part numbers
6540NCM152548 Optical Low Base Metal 10's Block NSN 6540-01-652-1559 Cross Reference: 08-3M1682A-10, 1394044
6540NCM152549 Optical Regular Base Metal 10's Block NSN 6540-01-652-1566 Cross Reference: 08-3M1678A-10, 1394045
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