6004152 Finishing aircraft engine parts with the aid of flexible-shaft rotary files and other tools driven from suspended electric motors at the Bristol Aeroplane Company\'s works (b/w photo) by English Photographer, (20th century); Private Collection; (add.info.: Finishing aircraft engine parts with the aid of flexible-shaft rotary files and other tools driven from suspended electric motors at the Bristol Aeroplane Company\'s works. Illustration for Engineering Workshop Practice by Arthur W Judge (new and revised edn, Caxton, c 1936).); by Look and Learn; English, out of copyright.