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.
I have not installed my doors yet. I will not be using Hanson's because it cost too much. I have to replace the front door (storm door and doorjamb/threshold are also included), the back garage door (entry door, leads out to backyard), and replace a plain, thin door between attached garage and house with a fire door. have not installed my doors yet. I will not be using Hanson's because it cost too much. I have to replace the front door (storm door and doorjamb/threshold are also included), the back garage door (entry door, leads out to backyard), and replace a plain, thin door between attached garage and house with a fire door.