B66-637 UNIVERSAL JOINT BRACE. Derlon Patent. Arthur Derlon's brace designed to bore holes in close quarters was patented in his native France, and in Belgium and Great Britain, as well as the US. This is a very uncommon example of the earliest type. Unlike later versions, its frame is plain cast iron without plating, it has no knob, and the grip is a simple copper sheath. Unmarked, but identical to the patent drawings. Cast iron is rough with pitting, but no damage and works smoothly. See Lot 99 for a different version. From the collection of Jim and Christa Schoenky. Good+ 200-400