Dovetail joint box work. It offers the strength found in the dovetail joint but is totally hidden from both outside faces by forming the outer edge to meet at a 45-degree angle while hiding the dovetails internally within the joint. The mitred corner dovetail joint is very similar in design, but it has just a single dovetail and is used for picture frames and other similar joins. The secret double-lapped dovetail is similar to the secret mitred dovetail, but presents a very thin section of end grain on one edge of the joint. Used for carcass and box construction to hide the
Mitre Corporation Mitre occupied in September 1959. After the SAGE project ended in the early 1960s, the FAA selected Mitre to develop a similar system to provide automated air traffic control. The result of the project formed the National Airspace System (NAS), that is still in use today. To support the NAS project and continual operations with the U.S. Department of Defense at the Pentagon, Mitre opened a second "main office" in McLean, Virginia. Through the 1960s, Mitre developed and supported military Command, Control, Communications and Intelligence (CI) projects, including the Airborne Warning and Control System (AWACS). Mitre also worked on a