"The formidable contraption shown in the mouth of Miss Pearl Nord is a gnathograph, invented by Dr. Beverly B. McCollum of Los Angeles and demonstrated before the chicago Dental Society. It records direction of bite and fit of teeth and accurately guides a dentist in straightening crooked teeth or fitting inlays, crowns, bridges and plates."
image source: Agi Haines
Category: Inventions | Patents | 1930s | Teeth