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May 29th, 2009 at 8:53 pm
They are punched out of wire stock. The hole is formed when it is punched out by a die.
References :
May 29th, 2009 at 9:10 pm
Try this for starters, I did not read all of it, but seemed to lead where you are going.
http://en.wikipedia.org/wiki/Sewing_needle
References :