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 5999-00-452-2558
NSN 6105-00-069-6009
NSN 6650-01-450-6335
NSN 5965-00-457-2496
NSN 6610-01-406-6696
NSN 5950-01-600-8820
NSN 6145-00-871-9112
NSN 5910-00-171-3414
NSN 5945-01-258-6587
NSN 5990-00-910-2415
NSN 6145-01-632-1083
NSN 5950-00-681-2109