I received British Patent Number: 376044A after discussion with Mark Craig Gerchman, Chief Optical Designer of Cooke Optics Limited.

He says that patent reveal all the details of 1931 production Pre Ansel Adams lens.

After the post came to me , I found that some glasses made by Chance Brothers. I contacted with them and requested the details. They said they dont have the catalogs anymore. Later Mark sent me the details.
I will post the word file with different title below.

Find the attached PDF file for above title.

Mustafa Umut Sarac
Istanbul