Files on files

Every household was once assumed to own a toolbox. General-interest magazines had ads for such items as Nicholson files. The Nicholson name is now owned by Cooper Industries, a Texas company, and the files of this company, founded in Rhode Island in the nineteenth century, are held by the Rhode Island Historical Society. Here's one such ad. I'm trying to find pages from the Saturday Evening Post, without success. I did find this great steel engraving: see the grindstones, the windows providing natural light, and the twin drive-shafts and individual harness-leather belts running from them.