story of the bomber, 1914-1945 / [by] Bryan Cooper ; illustrated by John Batchelor Deterrence before Hiroshima : the airpower background of modern strategy / George H. Quester elektische Bombenzünder / Rheinmetall - Rapport betreffende brief I.M.L. dd. 27 Februari 1936 No. 401A Onderwerp: Electrische bommenbuis / Luchtvaartafdeeling