I think it took them a long time to come off of standard wrenches and drop-forgings (eye hooks, lathe dogs, etc). They introduce the Vulcan Auto Tool in 1912, and the Demountable Rim Tool in 1914. Guessing late teens or 1920's. EDIT: Keep in mind that the first time a type of tool other than a wrench appears in a Williams 'Tools of Industry' catalog, it was 1941, and that was pliers, screwdrivers, and chisels. Not even any hammers. There are nothing but wrenches in the 1937 'Tools of Industry' catalog.
I do not, X. As you are doubtlessly aware, they proclaimed special order copper and bronze drop-forgings in the 1901 and 1912 catalogs, and they even have a special page in the back where they list the things they will do in copper and bronze, but wrenches are not one of them. Unfortunately, there is a huge gap in major catalogs in the public domain between 1912 and 1937 (both available at Internet Archive / International Tool Catalog Library (IA/ITCL)), and the 1937 is the first catalog I know of that lists the "Non-Sparking" wrenches by name and special part number, in their own section. There is a 1931 Superrench pamphlet on IA/ITCL, and it does not include any non-sparking, copper, or bronze wrenches or special order notes that I saw.
You didn't mention a 'no grinding, it's toxic' warning.