MRC:
Markings included on an item for the purpose of offering instructions or warnings or to indicate the purpose,function,or application of the item.excludes manufacturers part numbers,symbols,or the like.MARK
Special Markings:
Ac609, c614, c621, c622, c625, c626, c643, c645, c646, r619 through r626, r628 through r633, r635 through r638, r642, r643, r647, r656, r684, r686, r687, r688, r1648 through r1654, r1656, r1657, r1658, r1665, r1666, r1671 through r1675
MRC:
The specification,standard,or manufacturers reference,and the classification designation,such as type,class,grade,and the like,that identifies the surface treatment material.STDC
Surface Treatment Specification:
Mil-f-14072, -222, type 1 military specification single treatment response terminals