MRC:
The document designator of the specification or standard which established the item of supply.ZZZK
Specification Data:
81349-mil-h-6875 government specification and 96906-mil-std-792/i.C.1 government standard and 81348-fed-std-h28/sup 1a government standard and 96906-mil-std-129 government standard and 81349-mil-p-23199 government specification and 80204-aisi-18-b professional/industrial association standard and 81346-ams-5620 professional/industrial association standard and 81346-astm-a240 professional/industrial association standard and 81346-astm-a276 professional/industrial association standard and 96906-mil-std-767 government standard
MRC:
A feature of the item of supply which must be specifically recorded when the reference number covers a range of items.ZZZY
Reference Number Differentiating Characteristics:
Material will be in accordance with ships parts control center activity hx quality control, manufacturing and testing specifications
