[bvw]

Not a fact: "because by then [1961] manuals were not being produced ~ just repaired"

Typewriter companies were introducing new fully manual, non-electric models throughout the 1960's and continued manufacturing fully manual machines well into the 1970's, perhaps even later.

[muawiyah]

Lightweight portable machines ~ not the sort of thing you'd use in an office. I know WE didn't buy any manuals in the 1960s and we were a pretty big customer ~ with 31,000 business locations and 600,000 employees.

I did enough travel and worked in enough areas that I probably would have noticed if anyone had bought a manual typewriter ~