Kilborn & Bishop wrench

Kilborn and Bishop was a forging company located in New Haven, they started making tools in 1896. A little Googling shows some more S shaped wrenches turning up but the company made all sorts of hand tools as indicated in the ad below. Note the different logo styles.

There doesn't seem to be too much info online about the company, but they were involved with a lawsuit with Crescent Tool in 1917 regarding the manufacture of adjustable wrenches. In 1924 K & B acquired the Bay State Forge Company, makers of adjustable wrenches and the Autokit tool sets. The company seems to have ended in 1937 when it was split up between Moore Drop Forge and Peck, Stow, & Wilcox.