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          We started using local fiducials on 132 pin gate arrays with
  mounting fingers on ,025 centerline spacing. We placed .100 dia solid 
  pads on a diagonal within the footprint outline. Our in-house assembly
  people have now requested to incorporate local fiducials only on parts 
  with mounting fingers located on .020 centerline spacing or less.
  Hope that helps.
                                       Regards,
   Bob Vanech                                       Bob 
   Northrop Grumman                                
   Norden Systems

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