I wonder if any of our readers know of any books or articles about the coins, dies and minting equipment made by the Krupp company in Germany? Krupp is best known for its production of artillery and ships, but during most of the 19th century they also made minting equipment and dies, and they actually struck coins for some countries.

They produced the Italy 20 centesimi of 1894 using a KB mintmark (for Krupp Berlin). It has also been said that their Austrian factory struck the China 1936 nickel coins with "A" mintmark, though I have not been able to confirm this. This firm also produced machinery for the U.S. Mint in 1837.

I have found online some books about the Krupp company in general, including: "Alfred Krupp: A Sketch of His Life and Work" (1888) by K. W. Michaelis and Victor Niemeyer (available in reprint); and "Krupp: A History of the Legendary German Firm" by Harold James, Princeton University Press, 2012. But what has been published from a numismatic perspective?