ROYCO 500 | MIL-PRF-23699 ROYCO 880 ROYCO 886 E 889 ROYCO 756 | MIL-PRF-5606 ROYCO 1MS | MIL-PRF-83483 ROYCO 22 MS | MIL G-81827 ROYCO 64 | MIL-G-21164 ROYCO 308 CA | MIL-PRF 32033 ROYCO 586 | MIL-PRF 6086 ROYCO 22 CF | MIL-PRF-81322 ROYCO 27 | MIL-PRF-23827 ROYCO 555 | DOD-PRF 85734 ROYCO 782 | MIL-PRF-83282 ROYCO 482 | MIL-C-6529 ROYCO 885 | MIL-PRF-6085