observation sector

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Sector clock — A Sector clock was a round clock mounted on mahogany used at military airfields and observation posts in the United Kingdom to track the movements of enemy aircaft and control friendly aircraft. History They were originally known as colour change … Wikipedia
space exploration — Investigation of the universe beyond Earth s atmosphere by means of manned and unmanned spacecraft. Study of the use of rockets for spaceflight began early in the 20th century. Germany s research on rocket propulsion in the 1930s led to… … Universalium
Royal Observer Corps — Ensign Active 1925–1996 Country … Wikipedia
Ouvrage Hackenberg — Part of Maginot Line Northeast France … Wikipedia
Ouvrage Fermont — Part of Maginot Line Northeast France … Wikipedia
Ouvrage Schiesseck — Part of Maginot Line Northeast France … Wikipedia
Ouvrage Mont Agel — Part of Maginot Line, Alpine Line near Nice … Wikipedia
Ouvrage La Ferté — Part of Maginot Line Northeast France … Wikipedia
Ouvrage Sainte-Agnès — Part of Maginot Line, Alpine Line Sainte Agnès, Alpes Maritimes … Wikipedia
Ouvrage Kerfent — Part of Maginot Line Northeast France … Wikipedia
Ouvrage Immerhof — Part of Maginot Line Northeast France … Wikipedia

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