Propellor shaft securing key, tapered along its length, from ‘Gnome’ 50 HP 7-cylinder rotary aero engine, designed by Louis Seguin and Laurent Seguin, and made by La Société des Moteurs Gnome, France, 1908 Propellor shaft securing key, from ‘Gnome’ 50 HP 7-cylinder rotary aero engine 1908
