This is a follow on from his book covering French makers some years ago.
This one is from 2017 and I have not seen details of it yet.
It seems to follow the general plan of the previous book, but I hope editing hasn't been forgotten this time.
The main selected makers/innovators given chapters are the following:
Voigtlander
Petzval and Dietzler
Busch
Steinheil
Zeiss
There is an 11 page chapter on "other makers" which seems to me to be rather brief. I don't know who is included yet.
But I have found other makers here. Note that Goerz is included as one of these !!
http://www.oldphotographiclenses.com/some_others2.html
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