Go back to your first post on this matter and make the appropriate corrections then. Manual office non-portable non-electric typewriters were still being made in the 1960’s. Manual non-electric typewriters are still being made.
At the same time I've prefaced all my comments on such devices with "widespread" and "commercial use" ~ they just aren't showing up where people do real work these days.
I can think of several situations where you'd want them however. Out where you don't have electricity.
The claim was that someone's father bought a bunch of brand new manual typewriters in the 1970s. I simply asked what the nature of the business was.