BELGIAN
All the World's Aircraft · 1913 · p. 19
(Revised by M. BRACKE, Aeronautical Engineer & Editor of "L'Aero Mécanique.")
Bu kavram başka kaynaklarda da geçiyor
British Encyclopedia (1933)
The American Dictionary and Cyclopedia (1910)
Chamber's Twientieth Century Dictionary (1908)
The American Dictionary and Cyclopedia (1907)
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A Military Dictionary and Gazetteer (1881)
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