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H6 - Federal Item Name Directory
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22585
RING,RETAINING,OPTICAL ELEMENT
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FIIG: T271-J
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Entry Date: Apr-01-1974
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Concept:
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Status: A
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Applicability: JC
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Type: 0
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Definition: A cylindrical item having an internally flanged diameter designed to retain a lens or window in the objective end, or a diopter scale at the viewing end of an optical instrument. It may have one or more of the following characteristics: internal thread or machined for a press fit, method of securing, and/or knurled periphery. For externally threaded items, see RETAINER, OPTICAL ELEMENT. Excludes: CELL, OPTICAL ELEMENT; NUT, PLAIN KNURLED; NUT, PLAIN ROUND; and RING, RETAINING.
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Corresponding NIINs: 431
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