I've no capacity to write properly, a user manual!
All, I can do, is to take
Angriffsscheibe_Handbuch_3, and to rewrite its examples to DR3 Slide Rule, plus a few mathematical examples.
Possibly, in a series of posts, to which I'll add links in the first post. But, it will take me some time.
For those, who are used to working with logarithmic tools, it is easy to understand, how to use examples from Angriffsscheibe Handbuch manual with DR3 Slide Rule.