Semi-adjustable articulator with mounted casts. 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 the mandible in relation to the maxilla.
The Greek scholar Heron of Alexandria created the earliest known automatic door in the 1st century AD during the era of Roman Egypt. The first foot-sensor-activated automatic door was made in China during the reign of Emperor Yang of Sui (r. 604â618), who had one installed for his royal library.
Genie Door is a leading supplier of garage door parts and accessories. Founded in 1964, Genie has maintained its roots as a family business and continues to provide homeowners all over the country with openers, keypads, remotes, transmitters and just about any other part you could need for your garage door.