https://patentscope.wipo.int/search/en/detail.jsf?docId=US47... doesn’t mention “8-bit” at all, so why did they put “on 8-bit Compute hardware” in the title?

Seems it could at least slightly open up the world for doing it on 9-bit Compute hardware or (partially) in software, for example.

So, they invented the slide rule?

My mother has used such manually operating machine in the late 60s. It was called the slide ruler or something.