I just ran across this, that may be of interest: GerbMerge is a program for combining (panelizing) Gerber/Excellon files for printed circuit board manufacturing. It can panelize copies of the same job, different jobs, and can also rotate jobs. It can be found in windows/linux versions at: http://claymore.engineer.gvsu.edu/~steriana/Python/
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2004-04-27 by Roy J. Tellason