GRAZIANO SAG 14 LATHE, $7500, San Dimas, CA

Looks like a heck of a nice lathe. What the heck is this part though?

00F0F_5MVmzTibAHQz_0CI0t2_1200x900.jpg
Please excuse my ignorance!
 
I believe that's the hydraulic tracing unit, though it does look alien to my untrained eye as well
 
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