Clamp makers, out of Bridgeport, Connecticut. A newspaper article from 1928 mentions that the factory had survived a fire, so they'd been around since at least the 20's. They made a lot of different clamps, as my small inventory suggests:
They were still around in 1966 and were reported to have invented the pipe clamp, as shown in the news item below from Popular Mechanics of that year:
|Carl W. Bertsch. The WISE Handbook of Basic Home Carpentry.
New York: Wm. H. Wise & Co., Inc., 1952.
Cheap stamped tools, not forgings.
Warren also trademarked the phrase, "Quality your grandfather trusted." It seems that Warren was swallowed up by Walter Meier Holdings AG in Switzerland in 2002. WMH now only offers clamps under the Wilton trademark, so the Brink and Cotton name has disappeared. Hopefully, not with the quality your grandfather trusted.