I just noticed a mistake in your summary. Each sheet is produced by a set of tools, not a single tool. Each mark is produced by a single tool.
Okay. Are the classes of marks distinct by tool type- that is, if I see a mark on a sheet, I know whether it came from tool type X or tool type Y- or do we need to try and discover what sort of marks the various tools can leave?
Okay. Are the classes of marks distinct by tool type- that is, if I see a mark on a sheet, I know whether it came from tool type X or tool type Y- or do we need to try and discover what sort of marks the various tools can leave?
Fortunately, we know which tool types leave which marks. We also have a very strong understanding of the ways in which tools break and leave marks.
Thanks again for entertaining this line of inquiry.