MRC:
The lettering or design on the item,or that is the item.AYBM
Inscription:
Partial legend south wind model 939j24 coolant heater total output 23, 000 btu/hr coolant output 15, 000 btu/hr stock no. Serial no. Army n 1st side
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:
Qq-a-250/1, alloy 1100, h12 federal specification 1st material response or qq-a-250/1, alloy1100, h14 federal specification 2nd material response or qq-a-250/1, alloy 3003, h12 federal specification 3rd material response or qq-a-250/2, alloy 3003, h14 federal specification 4th material response