Comment by Moru

We learned typewriter in school, I think it was around 85-89. Most of the typewriters where completely mechanical and to erase you either had a fluid you painted over the character to delete, waited for a few seconds to dry and then could type over. Or you used a small piece of paper that had a white sticky backside. You pressed the go-back-button and then typed the letter that you wanted to erase while holding the paper in front of the paper.

We also had a slightly more modern typewriter that was electric and had memory for a few characters, automating the delete function by switching to an erase-ribbon and hitting the right key for you.

And some of the typewriters even had two colors you could switch between. Oh the memories :-) That is one class that I still have use for every day. Can't say that about many of the others.