Structure of Social Security Numbers. A Social Security Number (SSN) consists of nine digits, commonly written as three fields separated by hyphens: AAA-GG-SSSS. The first three-digit field is called the area number. The central, two-digit field is called the group number. The final, four-digit field is called the serial number.
Fabrication, is the building of something brand new, that's never been seen before, or invented. Manufacturing, is the duplication of something on a mass scale. Generally, the way it works is, you fabricate something that you need, then manufacture what you fabricate. A good example is, a car company decides to design a brand new car from the ground up.
Additive manufacturing is increasingly used in the development of new products: from prototypes to. functional parts and tooling. Additive manufacturing (AM) [1] is also referred to as rapid prototyping, additive fabrication, freeform fabrication, 3D printing, and rapid manufacturing, and uses advanced.