21978 is cataloged as SEAL,PLAIN ENCASED. It carries 3 NSN identities and cross-references to 29 related part numbers. The part appears on MCRL cross-reference data.
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00044, 11800, 11841, 13-463-4, 130-111, 20016, 20016M1, 200W16M1, 21158-0388, 221551, 28779, 34631, 4501458, 4501458-6, 450162, 48135-AG, 509A40, 5330PL0777982, DD936-S5501-149, DD936-S5501-1499308, DD936-S5501-1499308PC18, F219, F219-13-463-4, G3-4-3, M4548, N46640PC18, N49677PC18, N49704PC18, ND40069PC18
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