What are the numbers that id a circuit board and is it possible to find out if there are copy writed?

Engineer asked Nov 02,2021

I often find myself digging into circuit boards taking components off that I need or like. 

But always wonder what these "scrap" boards once were and if I am tearing apart a board that is useful in some way. 

I see what appears to be serial numbers on most boards. Would it be possible to look up these numbers on the U.S. Patterns web sight and figure out what these boards once were and maybe spare a few before they stealing components off of them ?

Thank you for your time educating us all here. I really enjoy the web page. 


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