Hamilton-Standard Controllable Propellers Service Bulletin 110A 1935
This is an authentic original pre-WWII-era Service Bulletin for Controllable Propellers made by Hamilton-Standard Propeller Company. This 50+ page document covers Operations and Maintenance for their line of Hydro-Controllable Propellers in use through 1935.
It is an original black-and-white, soft-cover manual full of illustrations and technical instructions. It is in very good condition for its age.