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Posted by David Sherman [72.47.9.228] on Tuesday, December 28, 2010 at 00:26:05 :
In Reply to: OK. More diff questions... posted by rick pacholski [98.26.211.168] on Monday, December 27, 2010 at 15:08:19 :
That's the image of a real plate that was really nailed onto the wooden pattern used to make the casting. It's common way to denote revision history or specialized variations. Sorry, I can't help with what the markings mean.