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On a 8501 X relay what do 2 letters stamped in the Forms box indicate?

This will be a date code. They stamped the date code in the box on the nameplate marked Forms. Forms typically have a digit after a letter and are in alphanumeric order. The old style date codes were 2 letters indicating the month and year the unit was built. We now use 4 digits that indicate the week and year the unit was built.


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