Ateliers de constructions Stapfer de Duclos et cie of Boulevard Maritime 42, Marseilles
Makers of stationary and marine steam engines and boilers, condensers, steam capstans ship's steering gear (Farcot-Duclos servomotors)
1865 Founded by Emile Duclos.
1874 Daniel Stapfer became manager.[1]
A 1/4 scale model of steam steering gear, made in 1882, is on display at the Musee des Arts et Metiers. Inv. No. 09910.
Description and drawing of steam steering gear (serve-moteur) here.
A 1920s example of Stapfer de Duclos steering gear is on display at the Rahmi M. Koç Museum in Istanbul [2]