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This article is about an aircraft of World War I. For the pre-war design of the same designation, see Breguet Type IV.
The Breguet Bre.4, also known variously as the Type IV and BUM, was a French biplane bomber of World War I. A fighter version of it was also produced as the BUC and BLC; some of these saw service with the British Royal Navy, which called them 'the Breguet 'de Chasse.