B421-5500 is cataloged as RESISTOR,VARIABLE,NONWIRE WOUND,. It carries 1 NSN identity and cross-references to 20 related part numbers. The part appears on MCRL cross-reference data.
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04260031-001, 054478-0503, 10047-715, 174-57747-213, 2100-3054, 2100-3306, 2101P, 25748-509C, 3006P, 3006P-1-503, 3006P-DM3-503, 3006P1-503, 41-11611-13, 586371-9, 6547521-002, 803510-503, 89PR50K, 9321-261024, 961-20-50K, RT5L503
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