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Charles A. Priest
Unknown. This is a pre-patent model likely produced professionally in Marion, Indiana
The Priest Grinder was intended to accommodate many of the most popular semi-adjustable articulators of the day, such as the Hanau H (pictured) and the Wadsworth. The power source for the grinding assembly was probably a bench lathe attached to the large pulley wheel. The grinding assembly attaches to the incisal pin producing a horizontal elliptical motion. The condylar and incisal controls are preset and provide the “anatomical” component of the motion.
Dr. Edgar N. Starcke's articles in the Journal of Prosthodontics have more information on the history of articulators.