Hex bolt with four holes through shaft, for Beardmore Heavy Oil diesel engine, from Airship R. 101 1928
Component associated with the Hawker Siddeley (Dynamics) 4 bladed metal propeller, propeller control unit and propeller synchrophase computer 1935-1977
Spark plug, for the Harold Hume Piffard Aeroplane E.N.V. Aero-engine type D (40hp), V8 cylinder, 1910