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What does the printed letters like EE means on the NEMA starters thermal units?

Issue:
What does the printed letters like EE means on the NEMA starters thermal units?

Product Line:
NEMA Starters and Contactors

Environment:
Products sold and used in the United States

Resolution:
The 2 letters printed on the thermal units like EE, AB represents the Date Codes - Old System Code Information. The first letter refers to the month, A being January, B February C March etc. and the second letter refers to the year: A for 1971, B 1972, C 1973, D 1974... X 1991 and goes back again to A 1992 and so on. The letters Y and Z are not used in the old date code system.
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