Solution:

The traditional typewriter includes a keyboard, which consists of buttons that are called keys. The pattern of the typewriter keyboard is similar to the keyboard of the computer. One or two letters, symbols or numbers are marked on each key. The key is part of a lever which has a bar of type attached to the other end. The bar of type corresponds to what is written on its key. If a letter is marked on the key, the corresponding piece of type will have that letter as two characters, one lower case and one capitalized. The typewriter also has a rubber roll called a platen. A platen holds the paper in the typewriter. A sheet of paper can be inserted into the typewriter, and rolled into place. The typewriter also includes an ink ribbon or a carbon tape.