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.
The Sheet Metal Door is a hinged door which is made out of sheets of metal and wood. It can be placed in an empty doorway and locked with a Lock or Code Lock. It is very resistant against damage from tools, melee weapons and bullets, but is extremely vulnerable to explosive damage and can be destroyed by a single Timed Explosive Charge. The Sheet Metal Door can be placed by crafting it and selecting the door in your hotbar, and then mousing over an empty doorway. A blue silhouette of the door will appear, and you can left-click to place it. If the silhouette of the door is red, it cannot be placed in its current location.