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easy question for some --- what is this mark?

Question asked by 1-N0A5OY on Dec 3, 2009
Latest reply on Dec 4, 2009 by Roland Schwarz

I've modelled a part, but I don't understand what these "f" marks are trying to tell the tool maker. this is not critical for my model but for my understanding.

mark.PNG

 

Thanks in advanced,

 

Shaun

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