when were ibm selectric typewriters invented
The IBM Selectric was introduced in 1961 (just like me!), and was revolutionary, in that the platen does not move, but instead the type element moves. The single type element (ball) has 88 characters on it, in 4 rows. This typewriter is a model 72, with a cloth ribbon in a plastic cartridge. It is a narrow platen model, they were available in 3 widths that I know of.