Critcal due to fit requirments.
An item that can generate a fundamental frequency with a high degree of accuracy. Harmonics of this fundamental are then used as a reference point for checking throughout the radio spectrum. The standard may be stable crystal oscillator, noncrystal oscillator, tuning fork, atomic beam, molecular beam, gas cell, quantum mechanical resonator, or the like.
Classification: Parts and accessories of articles of schedule b subheading 9030.39
NSN 5996-00-563-4251
NSN 5950-01-373-9064
NSN 6620-01-047-5831
NSN 5925-01-406-3455
NSN 5915-01-595-2266
NSN 5965-01-620-9414
NSN 5950-01-024-9461
NSN 6130-01-573-6832
NSN 6130-01-066-8319
NSN 5965-00-486-7907
NSN 7035-01-619-1268
NSN 6130-01-091-0959