On Fri, Oct 2, 2020 at 2:49 PM Frank Filippone wrote:

>
> Is there something written up in carpenters how to (training) books?
>

Here is a scan from my 1955 Popular Mechanics Do-It-Yourself Encyclopedia
from the section on stairbuilding that has a drawing of a
"stairbuilder's dado saw." Teeth are too small to see and description of
the saw's use is not detailed enough to answer the question.

https://imgur.com/VCtXGOF

Brian W