Ww2colourised - A female worker is testing a 20 mm cannon at the Aberdeen Proving Ground, 1942. The Hispano-Suiza HS.404 was a French 20 mm autocannon used in a number of air
Spitfire Mk V – 20mm Hispano Cannon - YouTube
The South African Air Force
Hispano Mk.II - WW II British aircraft cannon 20mm (4 pcs) CMK Q48193