MRC:
The specification,standard,or manufacturers reference,and the classification designation,such as class,condition,temper,and the like,that identifies the material.MDCL
Material Specification:
Mil-s-5059, cond 1/4 hard military specification 1st material response or mil-s-5059, cond 1/2 hard military specification 1st material response or mil-s-5059, cond hard military specification 1st material response or mil-s-5059, cond 1/4 hard, finish no. 2b military specification 2nd material response or astm a582 assn standard 3rd material response