Hi!
I first came across the font shown in the sample picture in the Mullard 1967 Book "PAL Colour TV – The PAL System & Mullard Circuits Described" and a lot of my T & M manuals – I asked if anyone could identify it, and got a reply that it was Courier, but in fact this isn't the case.
It is indeed a typewriter type font, and a camera font recognition tool found it – it's called "F25 Executive", and a version free for both private and commercial use can be downloaded here:–
https://fontsarena.com/wp-content/up..._executive.zip
Perfect for writing articles in late 1960s style!
Chris Williams