SO WHAT EXACTLY
An articulator is a mechanical device used in dentistry to which casts of the maxillary (upper) and mandibular (lower) teeth are fixed, reproducing recorded positions of a mandible in relation to the maxilla.
In 1840 the first US patent for dental articulator were issued to two Philadelphia dentists: James Cameron, and Daniley T.Evens. It wasn't until
1910 that dentistry had its first articulator breakthrough due to the work of scientist like W.W. Walker, Alfred Gysi and George Snow, who developed new articulators with condylar (anatomic) movement and geometric (non-anatomic) movement.