MRC:
Characteristics or qualities of an item,not covered in any other requirement,which are considered essential information for one or more functions excluding nsn assignment.SUPP
Supplementary Features:
Used on data transfer center matl: aluminum alloy casting A356-T6, grade c class 12, per MIL-A-21180, classification per MIL-C-6021, class 4; all surfaces: chemical film per MIL-C-5541, cl 3, using chemicals conforming to MIL-C-81706; exterior: 1 coat epoxy primer per MIL-P-23377, 1 coat epoxy polyamide per MIL-C-22750, color black 37038 per FED-STD-595