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TPS73250MDBVREP How to decode the marking on the package for Date Code

TPS73250MDBVREP   How to decode the marking on the package for Date Code. 

There is marking on the top only.  There are 4 letters and 5 small rectangles.

Looks like this.  K has 1 mark above it.  Q has mark above and below.

M has mark above and below.  See picture below.

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PKQM

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