Onsrud pin router.  Pin routers were used for duplicates in wood,
plastic, and aluminum before cnc.  Pattern includes a groove to 
follow a pin in the table concenctric with spindle.  Holes in pattern
that match pin can be used for rapid multiple hole location.
Pin routers have a quill, so pattern can be lifted off pin to relocate
to other pocketed sections, or holes.  Quill on this one is pneumatic
operation through a foot pedal.  Multiple stops inside head permit
setting various depths.