[OM] Why are those divots on the side of the tray?

[Bill Barber via olympus]

I've spent the better part of the day cleaning old processing trays. What  
are those annoying divots doing on the edge of Patterson trays. Impossible 
to  clean and as useless as teats on a boar hog.  Anyone have any idea why 
they  are there?
-- 
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