When we were taught to type, we used long-stroke hammer typewriters. The tab stop was a bit of metal with notches & clips. You set the tab stop with a ruler, an

When we were taught to type, we used long-stroke hammer typewriters. The tab stop was a bit of metal with notches & clips. You set the tab stop with a ruler, and each time you pressed tab it went to next stop. If your tab stop was worn out, the carriage would go right past the stop!