Hi Bill & friends,
Cool knives Bill & Ken!
I'm by no means an expert on German cutlery but here is what I could find on the net (German knife Forums ect.) and at least translate it for you guys.
The Metal factory Carl Rader was established around 1880 & was in the hands of the grounding family up untill at least 1939. After 1920, the name may have been changed to Karl Rader.
They mainly produced pocket knives, fixed blades, rasors & scissors. The company moved from location to location several times but stayed within Solingen, Germany.
In 1957 they were bought by the company DOVO (Fritz Bracht).
Stay tuned. To be continued.:
DOVO-Stahlwaren Bracht GmbH & Co. KG (the full company name) has been a Tradional Greman Shaving Razor manufacturing company for over 100-years.
Founded in 1906, the company
"DOVO" was named after it´s two founding fathers "Dorp & Voos". (Or, Carl
Dorp and Carl Arthur
Voos.) At the start, it was a Shaving Razor manufacturer but when Fritz Bracht took over the company in 1936, he added in scissors & pocket knives. Over the years & with continued Brand acquisitions the company expanded it´s product portfolio to also include fixed blades & manicure sets.
The company is still around and working in Solingen today and still makes "most" of it´s products by hand. After it filed for bankruptcy on April 21, 2020, it was taken over by an investor from Berlin named Jens Grudno. As far as I know, the company is still up and running under his command.
Thank you Mr. Grudno!

(By the way Mr. Grudno, I love knives & I´m looking for a job.)
The following Brands & companys belong to DOVO. (DOVO-Stahlwaren Bracht GmbH & Co. KG) I´m too lazy to translate the list but you´ll figure it out I´m sure.

Marke = Brand / Firma = Company
1952 – Marke Tennis (Rasiermesser)
1957 – Marke Bismarck (Rasiermesser)
1957 – Marke Ankerflagge (Rasiermesser) von Firma
Carl Rader
1968 – Firma Erich
Hartkopf; zu Scheren kamen Taschenmesser der Marke
Teufelskerle
1969 – Marke Kronpunkt (Rasiermesser) von Fa. Heups
1970 – Firma Fontana (Rasiermesser)
1973 – Firma Heups & Hermes (Pedikürzangen und Instrumente)
1996 – Firma Merkur (Rasiergeräte, Rasierhobel, Rasierklingen)
I own a couple Carl Rader & Hartkopf knives and I can say that they are of good quality IMO. Hope you all enjoyed this post. It was mostly just translating stuff, not really my knowledge. Some things I put into my own words for better understanding.
Oh, and the Carl Rader stamp shows an Anchor with crossed flags.
TCGB,
Edit: Was watching a German You Tube knife review video about a DOVO Teufelskerle pen knife with wood handles today. The reviewer pointed out that DOVO took over the company Erich Hartkopf. Which is not to be confused with the company Friedrich Hardkopf. Which I did. I have a Friedrich Hardkopf knife. Just thought I'd mention it.