GOSS  WORKHOLDING 6-1/2" POWER CHUCK AIR POWERED FIXTURE?  GOSS WAS MFG CHUCKS TO TIGHTEN AS RPM INCREASED THIS IS MARKED 1999 DON'T KNOW IF IT WAS PROTO TYPE. NORTHFIELD STYLE AIR IS THROUGH CENTER REAR OF CHUCK. HAS 3 SOFT JAWS AS SHOWN.